What's Under The Hood? Listen for 3 Minutes and Find Out!
Under The Hood show
What's Under The Hood? Listen for 3 Minutes and Find Out! Under The Hood show · Jul 6, 2026
What's Under The Hood? Listen for 3 Minutes and Find Out!

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48:11
What's Under The Hood? Listen for 3 Minutes and Find Out!
Ford F350
Car

Ford F350

The Ford F-350 is a bigger, heavier-duty pickup truck than a typical F-150. It’s often used for towing and tougher jobs. The podcast mentions it because this truck also uses a 10-speed automatic transmission.

Term

internal thermostat

A thermostat is a temperature control valve. If it’s built inside the system, the transmission fluid has to get hot enough for the thermostat to open, otherwise a flush won’t really move the fluid through the right paths.

Term

external thermostat

An external thermostat is a temperature control part that’s easier to access or manage because it’s outside the main unit. The hosts are saying this type is generally more workable for flushing than an internal thermostat.

Term

flush machine

A flush machine is a device a shop uses to replace old transmission fluid with new fluid. If the thermostat doesn’t open because the fluid isn’t hot enough, the flush won’t work as intended.

Term

super hot

They’re saying the fluid has to get hot enough to let the system flow. If it doesn’t reach that temperature, the flush won’t really move the fluid through the right places.

23 F-150
Car

23 F-150

The Ford F-150 is a popular pickup truck. In this segment, they’re talking about a 2023 F-150 with a 10-speed automatic, and that matters because the transmission fluid has to be heated correctly to flush properly.

Term

10 speed

A 10-speed automatic transmission has more gear steps than older multi-speed automatics. That can affect how the transmission behaves and how hot the fluid needs to get for service to work correctly.

Term

trans fluid

Transmission fluid is the fluid inside an automatic transmission. It keeps the moving parts lubricated and helps the transmission shift gears smoothly.

Term

pan

The transmission pan is the bottom part of the transmission that holds fluid. Taking it off can let you drain some fluid and check for metal bits or gunk.

Term

filter

A transmission filter is like a small screen inside the transmission that catches debris in the fluid. It can help, but it won’t fix problems caused by dirty or degraded fluid by itself.

Term

drain plug

A drain plug is a plug you can remove to let fluid out. Having one makes it easier to drain the transmission fluid without taking the pan off.

Concept

fluid exchange

A fluid exchange is when you replace some of the old transmission fluid with new fluid. Doing it more than once can help remove more of the old fluid than a single drain.

Term

valve body

In an automatic transmission, the valve body is like the control hub that directs fluid to make the transmission shift. If it’s updated, it’s often because the original design can cause problems like rough shifting or failures. Replacing it can be a targeted fix rather than replacing the whole transmission.

Term

billet part

A billet part is made by cutting metal from a solid chunk, which can make it stronger or more precisely shaped. In this case, it’s used inside the transmission’s valve body to change how fluid is routed. That’s part of the “no thermostat” upgrade strategy.

Term

ran through all the gears

After servicing the transmission, you cycle through the gears to make sure everything shifts properly. It checks that the fluid is reaching the right parts and that each gear engages. Doing it on a hoist helps keep the process controlled and safe.

Term

fluid looked nice

They’re talking about how clean the transmission fluid looked after they drained and refilled it. If it looks cleaner, it usually means there wasn’t as much gunk circulating. It’s a quick way to judge whether the service helped.

Term

re-manufactured unit

A re-manufactured transmission is a rebuilt one—usually starting from an old transmission core. The key point here is that the rebuilt unit should include an improved valve body setup. That’s meant to prevent the same kind of failure from happening again.

Term

bypass

A bypass is an alternate route that lets fluid go around a part of the system. Here, it’s being discussed as a change to how the cooling system moves coolant so the engine warms up correctly.

Term

thermostat opens

Your car has a temperature valve called a thermostat. When the engine is cold, it stays closed; when the engine warms up, it opens so coolant can go through the radiator to cool it properly.

Term

service bulletin

A service bulletin is like an official instruction from the car maker to mechanics. It tells them what problem they’re seeing and what fix the maker recommends.

Term

transmissions die

When someone says a transmission “dies,” they mean it fails early and starts acting up or stops working. The speaker is saying the bypass/cooling setup is important because it can affect how long the transmission lasts.

Term

drain and fill

Drain and fill means you remove some of the old transmission fluid and add new fluid back in. It’s a simpler, often cheaper approach than doing a full flush.

Term

full flush

A full flush is when the shop replaces a lot more of the old transmission fluid than a basic drain-and-fill. The tradeoff is it usually costs more and takes longer.

Term

E85

E85 is a fuel blend made mostly from ethanol. Some cars can run it, but if your car wasn’t designed for it, you usually need special tuning to use it safely.

Term

tune

A tune is software changes for your engine computer. If you switch fuels like E85, the computer needs to be adjusted so the engine runs correctly.

Term

software

The car has computer software that controls how the engine runs. When you change it, the engine can be adjusted to handle different fuels.

Term

BTU

BTU is a way to measure how much energy is in a fuel. If a fuel has fewer BTUs per gallon, you usually have to use more of it to travel the same distance.

Term

cost per mile

Cost per mile tells you what it costs to drive one mile. It considers both how expensive the fuel is and how much your car burns.

Term

E15

E15 is regular gasoline blended with a smaller amount of ethanol (up to 15%). It usually means you don’t have to burn as much fuel as you would with higher-ethanol blends.

BMW E30
Car

BMW E30

The BMW 3 Series is a smaller luxury car made by BMW. The podcast is specifically talking about the older E30 version, which is a well-known model from that family. It comes up because people compare costs and parts for that older generation.

Term

flex fuel

A flex-fuel vehicle can run on different ethanol blends. The car’s computer adjusts so it can handle fuels like E85 without you having to manually change settings.

Ford Flex
Car

Ford Flex

The Ford Flex is a family vehicle with a crossover-like design and a roomy interior. The podcast is talking about what kinds of gasoline it can use, including flex-fuel blends that contain more ethanol. In simple terms, it can run on certain higher-ethanol fuels depending on the version.

Honda Odyssey
Car

Honda Odyssey

The Honda Odyssey is a popular family minivan. The caller is worried about a specific engine system issue (VCM) and asks whether they should install a device to stop that system from operating.

Term

VCM problems

VCM is a system that can shut off some cylinders to save fuel. Some owners report problems with it, so people sometimes look for fixes or ways to prevent cylinder shutoff.

Toyota Sienna
Car

Toyota Sienna

The Toyota Sienna is another popular family minivan. The host is basically saying it’s a strong alternative to the Odyssey if you want something dependable.

Chrysler Pacifica
Car

Chrysler Pacifica

The Chrysler Pacifica is another minivan option. The host mentions it to show there are other good choices besides the Odyssey and Sienna.

Term

factory warranty

A factory warranty is the official coverage from the car maker. The host is basically saying don’t mess with it if you want to keep that warranty protection.

Term

maintenance light

The maintenance light is the car’s reminder that it thinks service is coming up. The host recommends not waiting for it if you’re trying to prevent problems.

Term

gummed up

“Gummed up” means parts get coated with sticky deposits. The host is saying that buildup can lead to failures.

Term

oil system cleaner

An oil system cleaner is a chemical you add to the engine oil to help break up gunk inside the engine. It’s usually run briefly, then you change the oil so the loosened dirt gets removed.

Term

piston ring gum up problem

Piston rings are like seals on the pistons. If they get stuck from oily gunk, the engine can start burning oil or not run as well, because the seal isn’t working right.

Term

fleet vehicles

Fleet vehicles are cars used for business operations (like delivery, service, or company transport) rather than personal ownership. The host suggests fleet use can correlate with fewer engine problems because the vehicles are driven regularly and serviced on schedule.

2012 Chevrolet Impala
Car

2012 Chevrolet Impala

A 2012 Chevrolet Impala is a regular GM family sedan. In this call, the problem is with the steering when the car is cold, and the discussion points to the power-steering system.

Term

hard steering

Hard steering is a symptom where the steering wheel requires more effort than normal. In hydraulic power steering systems, it often points to reduced hydraulic assist from low fluid, leaks, or failing pump/rack components—especially when cold.

Term

hydraulic system

A hydraulic system uses fluid under pressure to help move parts. Here, it’s talking about power steering fluid that makes turning the wheel easier.

Part

steering rack

The steering rack is the part that turns your steering wheel input into the motion that actually steers the wheels. If its seals don’t work well when the car is cold, the steering can feel stiff.

Term

power steering fluid

Power steering fluid is the fluid that helps your steering system work. If it’s low, leaking, or the wrong type, the steering can feel stiff—often more noticeable when the car is cold.

Part

pump

The power steering pump is what pushes fluid through the system to help you steer. If it’s not moving fluid—especially when cold—that can make the steering feel heavy.

Term

low brake pedal

If your brake pedal feels like it sinks too far before braking, that’s a “low brake pedal.” It can be caused by problems in the brake fluid system or brakes that aren’t sliding/moving correctly.

Term

sticky caliper pin

In many cars, the brake caliper slides on small guide pins. If one of those pins gets stuck, the brakes can feel wrong—like the pedal is low or braking isn’t as responsive.

Term

caliper piston

The caliper piston is the brake’s “push rod” inside the caliper. When you press the brake pedal, it moves to squeeze the pads against the rotor—if it’s stuck, braking can feel weak or uneven.

Term

channel locks

Channel locks are adjustable pliers. Here, the host is saying you can use them to gently push the brake caliper piston back in to see if it moves freely.

Term

master cylinder

The master cylinder is the part that turns your brake pedal push into brake fluid pressure. If it’s not working right, the pedal can feel low or the brakes may not respond normally.

Term

caliper slides

Caliper slides help the brake caliper move smoothly so the pads can clamp correctly. If they get stuck, the brakes can drag or feel wrong, and the pedal may not behave normally.

Company

berkeley one classics

Berkeley One Classics is an insurance company that specializes in classic and collector cars. They help set a value up front, so if something happens, you don’t have to argue about what the car is worth.

Term

agreed value policy

An agreed value policy means you and the insurance company agree on what the car is worth before anything happens. If the car is lost, they pay that agreed amount instead of trying to lower it later.

Term

collector car coverage

Collector car coverage is insurance designed for special cars that aren’t driven like normal daily vehicles. It’s often set up to protect the car’s real value, especially when it’s stored.

Term

roadside emergency toolkit

A roadside emergency toolkit is a bag of tools you keep in your car for problems like minor breakdowns. The idea is to have the basics on hand so you can deal with an issue quickly.

Company

advance auto parks

They’re mentioned as the group giving away a roadside emergency toolkit. It sounds like an auto-parts-related company, but the name in the transcript may be slightly off.

Term

electrical leak

An “electrical leak” usually means a parasitic draw—something in the vehicle keeps consuming power when the car is off. That can drain the battery over time and often points to a wiring fault, a stuck module, or an accessory like an audio unit.

Term

power locks

Power locks are the electric door-lock switches and motors. If they stop working along with other interior electrical items, it can mean the car’s electrical control system is having trouble.

Term

dome light

The dome light is the light inside the cabin that turns on when you open the door. If it doesn’t work along with other interior features, it can suggest a bigger electrical problem.

Term

body control module

The body control module is the car’s main computer for things like interior lights and power door locks. If those start acting up at the same time, the module (or what’s feeding it power/communication) may be the problem.

Term

radar sensor

A radar sensor is what the alarm uses to “notice” motion near the car. It sends out radio waves and looks for changes that suggest someone is trying to get in or mess with the vehicle.

Term

pain generator

A “pain generator” is a type of car alarm deterrent that can shock someone if they try to mess with the car. Some states banned it because it could seriously hurt people.

Term

handheld tasers

Handheld tasers are portable devices that deliver an electric shock to incapacitate a person. In the transcript, the host uses them as an analogy for how the alarm’s “pain generator” deterrent works—electric shock delivered through the alarm system.

Term

electric fence

An electric fence is a barrier that shocks you if you touch it. They’re using it as a comparison for how the alarm’s deterrent shock works.

1998 gmck 1500
Car

1998 gmck 1500

This sounds like a 1998 GMC Sierra 1500 truck. The caller says it shakes briefly when they speed up around 50 mph, especially if they press the gas more firmly.

Term

misfire

A misfire is when one cylinder doesn’t light the fuel like it should. The engine then runs rough or stumbles, and it can feel like it’s about to quit.

Term

ignition coil

The ignition coil makes the strong electrical spark that lights the fuel in the engine. If it’s failing, the engine can misfire and run badly.

Term

spark plug wires

Spark plug wires deliver the electricity that creates the spark at each cylinder. If the wires are old or damaged, the spark can be weak and the engine may misfire.

Brand

Standard

Standard is a brand of replacement auto parts. The host is saying their cap and rotor are meant to be bought as a matched set for the distributor.

Brand

AC Delco

AC Delco is a parts brand that makes things like ignition components. The point here is to buy the cap and rotor as a matched pair instead of mixing brands.

Term

distributor

The distributor is an older ignition part that sends spark to the spark plugs in the correct order. It works with the cap and rotor to make sure each cylinder gets spark.

Term

brake rotors

Brake rotors are the spinning metal discs your brake pads squeeze to slow the car down. They’re used as an example of how some parts prices have gone up.

2006 GTO
Car

2006 GTO

The Pontiac GTO is a famous muscle-car model. Here, the host is just mentioning a 2006 GTO as part of what someone has in the garage.

55 Chevy pick up
Car

55 Chevy pick up

This is a classic 1955 Chevrolet pickup truck. The conversation is about why it won’t run right, and they check things under the hood to find the cause.

Term

one barrel carburetor

A carburetor is the part that mixes fuel and air for the engine. A one-barrel carb has one main “path” for that mixture, and if it’s acting up, the engine can flood and foul the spark plugs.

Term

235 six

“235 six” is shorthand for an older Chevrolet inline-six engine. If the truck sits for a while, fuel and spark problems can show up fast, especially as fouled spark plugs.

Term

six volt system

Some older cars used a 6-volt electrical system instead of today’s 12-volt setup. If parts are converted incorrectly, the ignition can act weird and the engine may not start properly.

Term

12 volt system

Most cars today run on a 12-volt electrical system. If an older car gets converted to 12 volts, the ignition parts have to be right too, or the spark can be weak or inconsistent.

Term

point system

Breaker points are an older ignition method that mechanically turns the spark on and off. The coil needs that on/off action to make the spark, so worn or faulty points can cause starting and running problems.

Term

condenser

The condenser is a small electrical component that helps the ignition system switch cleanly. It works with the points so the coil can generate a strong, consistent spark.

Term

test light

A test light is a basic tool that lights up when electricity is present. The host uses it to confirm whether the ignition circuit is switching properly when the points move.

Brand

pertronics

Pertronix makes aftermarket ignition parts. In this story, it’s suggested as an upgrade that replaces old breaker points with an electronic system to help prevent point-related ignition issues.

Term

points issue

Breaker points can wear out or stop working correctly, and that can ruin the spark. The host is saying electronic ignition kits can help avoid those point problems.

Term

flood it out

“Flooding” means the engine gets too much fuel. When that happens, the spark plugs can get wet and black with fuel, making it hard to start.

Term

air cleaner

The air cleaner is a filter on the engine’s air intake. It helps keep dust and dirt from getting into the engine so the car can run correctly.

Term

duct tape

They’re using duct tape as a quick fix to cover something on the engine. It can work temporarily, but it’s not a real repair for how the engine is supposed to be sealed and protected.

Term

choke

The choke helps a carbureted engine start when it’s cold by making the fuel mixture richer. It’s basically a starting aid so the engine can catch and run until it warms up.

Concept

classic vehicle

A classic vehicle is an older car that people care about because of its history or style. In general, how complete and how well it runs can strongly affect what it’s worth.

51 Ford tractor
Car

51 Ford tractor

They’re talking about an old Ford tractor from 1951. A tractor is a farm machine used for work like pulling equipment or moving heavy loads. Here it’s just where the person put an insurance card.

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