And You Thought You Had Car Problems - These Guys Can Help
Under The Hood show
And You Thought You Had Car Problems - These Guys Can Help Under The Hood show · Jul 8, 2026
And You Thought You Had Car Problems - These Guys Can Help

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And You Thought You Had Car Problems - These Guys Can Help
2013 Nissan Frontier
Car

2013 Nissan Frontier

This is a mid-size pickup truck from Nissan. The person asking is wondering if they should change the truck’s fluids just because it’s old, even though it doesn’t have many miles on it.

Term

Fluid changed

This means replacing the truck’s different fluids that keep parts working smoothly. The person is asking whether they should do it because the truck is old, even though it hasn’t been driven much.

Concept

low mileage

Low mileage means the truck hasn’t been driven much. The question is whether “not driving it” is enough to skip maintenance, or whether time alone can still wear out the fluids.

Concept

cool heated garage

Where you park the car matters. A heated garage can reduce temperature swings and moisture, while a non-heated garage can let more condensation build up.

Lamborghini Kuntosh
Car

Lamborghini Kuntosh

The Lamborghini Countach is a classic, very famous supercar from the late 1900s. In this story, someone bought one new but didn’t really drive it—more like kept it as a display piece.

Tesla Roadster
Car

Tesla Roadster

The Tesla Roadster is one of Tesla’s early electric sports cars. Here it’s mentioned as a ridiculous idea—like getting it back from space just to display it.

Term

transfer case

The transfer case is what sends power to both the front and rear axles on a 4WD truck. It has special fluid that needs changing so it can keep working properly.

Term

rear differential

The rear differential is another set of gears that helps the rear wheels spin at different speeds when you turn. It also needs its own fluid changes.

Term

front differential

The front differential is a set of gears that helps the front wheels turn at different speeds when you’re cornering. It has special fluid that needs periodic changes to keep the gears healthy.

Term

differentials

A differential is a set of gears that helps your wheels turn at different speeds when you’re cornering. That’s important for smooth handling and to avoid drivetrain binding.

Term

differential fluid

Differential fluid is the oil that keeps the gears inside the differential running smoothly. If it gets old or contaminated, the gears can wear faster.

Term

required maintenance

Required maintenance is the list of services the car maker says you should do at certain times. It can be based on mileage, but also on how old the car is.

Concept

age-based service intervals

Some car services are recommended based on the car’s age, not only mileage. Oils and fluids can wear out over time even if you don’t drive a lot.

Term

coolant flush

A coolant flush replaces the old antifreeze/coolant with new fluid. It helps the engine run at the right temperature and protects against corrosion inside the cooling system.

Term

transmission fluid

Transmission fluid is the liquid that keeps the transmission parts moving smoothly and helps it shift properly. If it looks dark or dirty, it can be a sign the transmission has been working too hard or isn’t being maintained well.

Term

dipstick

A dipstick is a simple tool you pull out to check how much fluid is in the vehicle. It can also help you see if the fluid looks dirty or worn out.

Term

brake fluid

Brake fluid is the special liquid that helps your brake pedal actually squeeze the brakes. With age, it can soak up water, which can make the brakes less effective when things get hot.

Concept

absorbed a lot of moisture

Over time, water can get into brake fluid. That can cause corrosion and can make the brakes perform worse, especially when you’re stopping hard or driving in heat.

1968 Dodge Charger Hemi
Car

1968 Dodge Charger Hemi

This is a 1968 Dodge Charger with a HEMI V8. “Hemi” is a famous engine design, and the blower means it’s using extra air pressure to make a lot more power than a normal Charger.

Term

blower

A blower is a device that pushes more air into the engine. More air usually means more power, which is why cars with blowers can feel dramatically faster.

Hummer H1
Car

Hummer H1

The Hummer H1 is a very rugged, off-road SUV that looks like a military vehicle. People collect it because it’s big, tough, and has a reputation for going almost anywhere.

Old Ford escorts
Car

Old Ford escorts

They’re talking about Ford Escorts—compact cars made by Ford. They’re saying the ones there were in great condition, like you’d expect from a collector’s display.

1948 Studebaker truck
Car

1948 Studebaker truck

This is a specific old truck: a Studebaker from 1948. The year is important because older trucks had different wiring and electrical setups than today.

Term

flatbed fabricated

A fabricated flatbed is a custom-built truck bed platform added or modified by a fabricator. In this case it’s replacing the original grain/livestock box setup, which changes how the truck is used and can affect mounting and wiring for rear lighting.

Term

six volt positive ground electrical system

This truck uses a 6-volt electrical system, and the “positive” side of the battery is connected to the metal body. That matters when you add new electrical parts, like lights, so they work correctly.

Term

24 inch round led tail lights

These are LED tail lights—newer-style lights that use diodes instead of old bulb filaments. On an older truck, you may need to make sure they’re wired correctly for the truck’s electrical setup.

Term

Dual polarity led light

Some LED lights only work one way electrically. A “dual polarity” LED is made to work whether the car is wired positive-ground or negative-ground, so you don’t have to change the wiring as much.

Term

flat led

A flat LED is a thin LED light module that replaces a bulb. Instead of one bulb wire, it can have multiple wires so it can do more than one lighting function.

Term

turn signal

Turn signals are the blinking lights that tell other drivers you’re turning left or right. Here, the speaker is explaining which wire controls that blinking function.

Term

ground lead

A ground lead is the wire that completes the electrical circuit. If it’s connected the “wrong way” for the device you’re installing, the device may not work correctly.

Term

dual function

A dual-function light can do two jobs, like turn signal and brake light. If the wiring polarity is wrong, it might only work for one of those jobs.

Term

polarity reversing device

This is a small electrical adapter that flips the wiring so the device sees the polarity it expects. It helps you avoid rewiring the whole car.

Term

polarity reducing converter

This is a converter that changes the electrical “direction” the accessory expects. It’s used when your car’s wiring polarity doesn’t match the new part.

Term

steering wheel isn't just right

The caller is saying the car won’t start unless the steering wheel is in the right position. Some cars have a lock or safety feature tied to the steering wheel, so if it’s turned the wrong way, the ignition won’t work normally.

Term

put it in neutral

Neutral is a gear position where the engine isn’t driving the wheels. Many cars won’t start unless the shifter is in the correct position (like neutral or park), as a safety check.

Concept

curb thing

A curb is the raised edge of the road. If you hit it, your tires or steering can get stuck or misaligned, making it hard to move the car.

Term

locked up

“Locked up” means the steering wouldn’t move. That can happen when the car’s steering lock engages, so you can’t turn the wheel to get the car out of trouble.

Term

tow

A tow is when someone moves your car for you because it won’t run or can’t be driven. Here, they’re talking about a way to let the wheels move so the car can be pulled.

Term

gear changer

The gear changer is the lever or selector you use to choose what the car should do—like Park or Drive. Some cars also have a special towing-related release near that area so the car can be moved.

Acura RLs
Car

Acura RLs

Acura is Honda’s luxury brand. The Acura RL is a sedan, and here they’re talking about a repo situation involving that model line. It’s mainly a setup for explaining how turning the wheel while turning off the car can affect the ignition lock.

Term

lock cylinder system

The lock cylinder system is the part in the ignition/steering lock that your key turns. If you shut the car off while the steering wheel is still turned, the parts can fight each other and jam, which can wear out or damage the lock.

Term

electronic wheel

“Electronic wheel” means the steering is helped by electronics (not just your arms). When you turn the key off while the wheel is turned, the steering help can stop and push back, which can make the key/lock jam.

Term

pump shuts off

The “pump” is part of power steering that helps you turn the wheel. If the car turns that help off while you’re still holding the wheel turned, the steering can push back and interfere with the ignition lock.

Term

push button starts

Push-button start means you start the car with a button instead of turning a key. The host is saying the problem can still happen even if the car uses a push-button system.

Term

solenoid system

A solenoid is an electrically controlled part that can “pull” or “push” something inside the car. Here, it’s mentioned because it may be what’s preventing the shifter from releasing normally.

Term

break override

A brake override is a system that can apply the brakes in a special situation to keep the car controlled. Here it’s mentioned as an older method used when the car is on a slope.

Term

park assist brake

A park assist brake helps keep the car from rolling while you’re parking. The idea is to hold the car securely so the parking mechanism doesn’t get stressed or jam when you release it.

Term

starter

The starter is the part that turns the engine over when you turn the key. If it’s getting power, it suggests the starting problem may be elsewhere.

Term

release solenoid

A release solenoid is an electronic part that helps unlock the transmission so you can move out of Park. If it’s not working right, the shifter can feel stuck or won’t release properly.

Term

floor shifter mechanism

That’s the parts under the floor that connect the gear lever to the transmission. If it gets damaged, the truck may not shift into or out of Park correctly.

Ford F150
Car

Ford F150

A Ford F-150 is a popular full-size pickup truck. This caller says they have questions about their 2002 F-150, so the discussion is likely about a problem specific to that truck.

Term

battery saver relay

Cars sometimes have a “don’t drain the battery” timer for things like interior lights. A battery saver relay is the switch that should turn those lights off after a short time. If it’s stuck or broken, the lights can stay on and drain the battery.

Term

accessory power

Accessory power is the car’s “low-power” electrical mode for things like interior lights and radio. It’s supposed to turn off after a while. If it doesn’t, those items can stay on and drain the battery.

Term

wrap relay

This sounds like the specific relay that controls whether the interior lights should turn off. If the relay gets stuck, the lights may never shut down. Swapping it with another similar relay can help confirm the fault.

Term

wiring diagram schematics

A wiring diagram is a map of the car’s electrical connections. It shows which wires and parts talk to each other. Mechanics use it to track down why a light or relay isn’t working correctly.

Term

fuse box

A fuse box is where the car’s fuses (and often relays) are housed to protect electrical circuits from overloads. If a relay or fuse related to interior lighting is faulty, it can cause lights to stay on or fail to turn on.

Term

internal door latch

The door latch has a sensor that tells the car if the door is open or shut. If that sensor thinks the door is still open, the car may keep the interior lights on. Fixing or adjusting the latch/sensor can solve the issue.

Term

dome light

A dome light is the small interior light on the ceiling of the car. It usually turns on when you open a door, and some cars will turn it off after a while to save the battery.

Term

door latches

Door latches are the parts that keep the door securely shut. If they’re failing or sticking, the car may think the door is still open, so the interior lights stay on.

Term

integrated latch assembly

An integrated latch assembly is a latch system where more parts are built together as one unit. That can affect what gets replaced when the door starts acting up.

Term

body control module

The body control module is like the car’s computer for the comfort/electrical stuff inside the vehicle. It can tell lights when to turn on and off, so if a light won’t go out, the BCM is a likely suspect.

Term

scan tool

A scan tool is a device a mechanic plugs into the car to read what the car’s computers are reporting. It helps them see whether the light problem is coming from the car’s control system.

Term

short in the wiring

A wiring short is when two wires (or a wire and ground) accidentally touch, causing electricity to flow incorrectly. If unplugging the computer doesn’t fix the light, the problem may be in the wiring itself.

Term

moisture trail

A moisture trail is basically a path where water leaked and got into the car’s electronics. Water can mess up electrical connections, so it can explain weird behavior like lights that won’t turn off.

Term

four-wheel drive

Four-wheel drive means the car can send power to all four wheels to help with traction. If the same computer controls 4WD too, fixing it can be more complicated than just the lighting issue.

Term

cylinder number three

An engine has multiple cylinders, and “cylinder number three” means one specific one. If that cylinder is misfiring and you see white smoke, it can mean coolant or another problem is getting into that cylinder.

Term

head gasket

A head gasket is the sealing layer between the engine block and the cylinder head. If it fails, combustion gases and/or coolant can leak into the wrong places, which can cause misfires and white smoke from coolant burning in the cylinders.

Term

cracked head

A cracked head means the metal top of the engine has a fracture. That can let coolant leak into a cylinder, causing misfires and white smoke.

Term

3.6 v6

“3.6 V6” means the engine is 3.6 liters total and has six cylinders arranged in a V shape. Different engines can have different common problems, so knowing the exact engine helps diagnose the issue.

Chrysler Pacifica
Car

Chrysler Pacifica

The Chrysler Pacifica is a minivan, which is a type of vehicle built to carry people and cargo comfortably. The podcast mention sounds like mechanics are working on the engine, including replacing motors. That’s useful if you’re thinking about owning one and want to know what repairs can involve.

Term

seepage through the cylinder wall

This means fluid is leaking through the inside wall of the cylinder. If coolant gets into the cylinder, it can cause misfires and white smoke, and it may require replacing the engine rather than a simple gasket fix.

Term

K seal

K-Seal is a liquid sealant you add to the cooling system to try to stop small leaks. If the leak is too big or the damage is too severe, it won’t be able to seal it.

Byd Seal
Car

Byd Seal

The BYD Seal is an electric car. The podcast mention about trying “K seal first” sounds like they’re talking about using a leak-stopping product before doing other repairs. They also reference mileage, which suggests they’re deciding whether that approach makes sense for the car’s condition.

Term

permanently fix

They’re talking about whether the sealant can truly stop the leak long-term. The key point is that it only works for small leaks; if the damage is bigger than the product is designed for, it won’t hold.

Term

remanufactured engines

A remanufactured engine is an older engine that gets taken apart, checked, and rebuilt with new or refurbished parts. It’s meant to work like a properly rebuilt engine, usually for less money than a brand-new one.

Company

Jasper

Jasper is a company that rebuilds engines and sells them to repair shops. Here, they’re being used as the replacement engine option.

Term

three-year 100000 mile warranty

A warranty is the promise that if something goes wrong within a set time and mileage, the company will cover the repair. They’re saying this remanufactured engine comes with a three-year, 100,000-mile warranty.

Term

camshaft and lifter failures

The camshaft and lifters work together to open and close the engine’s valves. If they fail, the engine can lose correct valve timing and can develop serious running problems.

Term

porous block issues

“Porous block” means the engine block casting has tiny flaws that can let fluids seep through. That can cause leaks that are hard to fix with a simple gasket replacement.

Term

misfires

A misfire is when one or more cylinders don’t burn the fuel correctly. The engine can shake, run rough, and sometimes produce smoke or poor power.

Term

valve failure

An engine valve failure is when the valves inside the engine aren’t sealing or working right. That can cause misfires and poor compression, which is why the engine may run rough or fail.

Term

leak down test

A leak-down test checks how well an engine cylinder seals. The mechanic listens for where air escapes; if it comes out through a valve, that points to valve/head trouble.

2005 Chevrolet avalanche
Car

2005 Chevrolet avalanche

This is a 2005 Chevrolet Avalanche, a full-size vehicle that mixes pickup utility with SUV comfort. The host is using it to explain how they’d track down why it’s running badly and smoking.

Term

fuel trims

Fuel trims are numbers the car’s computer uses to fine-tune how much fuel the engine gets. If one side’s numbers are way off compared to the other, it can point to a problem on that bank.

Term

throttle body

The throttle body controls how much air the engine gets. If it’s dirty, the engine may not idle or respond correctly, which can contribute to running rich or smoking.

Term

fuel pressure

Fuel pressure is the “push” of fuel getting to the engine. If it’s too low or too high, the engine can get the wrong fuel amount and start running poorly.

Term

injector

An injector is the part that sprays fuel into the engine. If it leaks or doesn’t shut off properly, the engine can get too much fuel and run rough.

Term

mass airflow sensor

The mass airflow sensor tells the computer how much air is going into the engine. If it’s inaccurate, the computer may add the wrong amount of fuel.

Term

purge valve

A purge valve routes fuel vapors from a charcoal canister into the engine. If it doesn’t work right, it can change how the engine runs, but it usually wouldn’t affect only one bank.

Term

o2 sensor

An O2 sensor checks how much oxygen is in the exhaust. The computer uses that info to fine-tune the air-fuel mix, and a bad sensor can trick you into chasing the wrong problem.

Term

upstream or downstream

Upstream and downstream sensors are two oxygen sensors placed at different points in the exhaust. They help you tell whether the catalytic converter is doing its job.

Term

catalytic converter

The catalytic converter is the emissions “cleaner” in the exhaust. If it gets clogged on one side, the exhaust flow changes and the engine may start running too rich on that bank.

Term

run rich

Running rich means the engine is getting too much fuel compared to air. That can make it smell strong, foul plugs, and cause the computer to keep adjusting.

Term

pressure gauge

A pressure gauge is a tool that measures pressure. They use it during diagnosis to confirm which side/bank is showing abnormal readings.

Term

manifold

A manifold is the part that routes gases around the engine. Where you measure near the manifold can change what the readings look like.

Term

oil burning

Oil burning is when the engine uses oil instead of just fuel. It can happen as parts wear, and it can mess with exhaust readings and engine running.

Term

swap them

Swapping sensors means moving an O2 sensor to a different spot to see if the bad readings move with it. If they do, the sensor is likely the problem.

Term

rhodium

Rhodium is a rare, expensive metal that’s used inside catalytic converters. Because it’s valuable, thieves often steal the whole converter to sell the metals.

Term

reverse polarity

Reverse polarity means the car’s battery connections are wired “backwards” compared to most modern cars. Some parts may not work correctly unless you change the wiring or use parts made for that older setup.

Term

convert it to 12 volt

Older trucks sometimes used a lower-voltage electrical system (like 6 volts). Converting to 12 volts is an upgrade that makes it easier to run common modern lights and electronics.

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