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Flushing Coolant and Other Things To Do Yourself At Home

Flushing Coolant and Other Things To Do Yourself At Home

Under The Hood show Oct 12, 2025 48 min
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About this episode

Flushing coolant and tackling DIY automotive tasks take center stage as the hosts answer listener questions about maintenance and repairs. From cleaning a rusty cooling system in a 1995 F-150 to addressing air pockets in a 2000 GMC Topkick, the episode is packed with practical advice. Listeners also learn about the importance of matching tire tread depths in all-wheel drive vehicles and the challenges of replacing engines and vacuum pumps. The hosts share their expertise and personal anecdotes, making complex topics accessible for DIY enthusiasts.

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Technical Too Afraid to Ask
Car

Ford F150

"Well, Chris, I got a couple of questions on my 95 F-150. I've got very rusty, brown-colored coolant."

The Ford F-150 is a big truck that people use for work and everyday driving. The 1995 version is known for being tough and reliable.

Part

cooling system cleaner

"Our partner Justice Brothers has a cooling system cleaner. You can put in there."

A cooling system cleaner is a special liquid you add to your car's cooling system to clean it out and keep it working properly.

Company

Justice Brothers

"Our partner Justice Brothers has a cooling system cleaner. You can put in there."

Justice Brothers makes products that help keep cars running well, like cleaners for the cooling system.

Term

antifreeze

"You're going to want to put it in with the antifreeze, run it probably like an hour with their cleaner..."

Antifreeze is a liquid that helps keep your car's engine from freezing in winter and overheating in summer.

Part

thermostat

"...take the thermostat out of the block, put it back, put the cap back on the thermostat housing..."

The thermostat helps keep your engine cool by controlling the flow of coolant. If it gets stuck or fails, your engine could overheat or run too cold, affecting performance.

Part

radiator hose

"...pull off the lower radiator hose on the bottom."

Radiator hoses are tubes that help move coolant around your engine and radiator. If they wear out or leak, it can cause your engine to overheat.

Company

Peak

"...our partner Peak makes lots of different coolants. So they've got premixed."

Peak is a company that makes products for cars, like coolants that help keep the engine from getting too hot.

Part

coolant

"Test the coolant with the cap off. Test it and make sure that that coolant is the proper strength."

Coolant is a special liquid that helps keep your car's engine from getting too hot. It moves around the engine to absorb heat and then cools down in the radiator.

Term

tranny fluid

"Uh, what tranny fluid needs to go back in or if I need to add some, just the regular Ford tranny fluid, or does that rebuilt company suggest something else?"

Tranny fluid is the oil that helps your car's automatic transmission work properly. It keeps everything running smoothly and prevents overheating.

Term

owner's manual

"Otherwise, whatever the owner's manual says in, in that vehicle, whether it's a merc on or a merc on LV or whatever that one is."

The owner's manual is like a guidebook for your car. It tells you how to take care of it and what kind of fluids or parts you should use.

Car

GMC Topkick

"...I just was changing to do a coolant change on a 2000 GMC Topkick with a 454 running propane. I pulled the lower hose to the radiator and got, no, I felt a good amount out of it..."

The GMC Topkick is a tough truck that can handle heavy loads. It has a strong engine and is often used for work, like towing or transporting goods.

Part

heater hose

"Or take the uppermost heater hose off the one that goes to the top of the intake air. Take that off and fill it until it comes out."

A heater hose is a tube that moves hot coolant from the engine to the heater inside the car, helping to keep the engine cool and warm up the inside of the car.

Brand

GM

"This truck and many other GM vehicles, it seems like not for a Chrysler."

GM stands for General Motors, a big company that makes cars and trucks. They own several popular car brands like Chevrolet and GMC.

Brand

Chrysler

"This truck and many other GM vehicles, it seems like not for a Chrysler."

Chrysler is a car company that makes different types of vehicles, like cars and SUVs. They are known for their stylish designs and family-friendly minivans.

Car

Ford Flex

"...n, it says, is it propane or is it gas? Or is it flex fuel? They made a bunch of them."

The Ford Flex is a big car that looks a bit different from other SUVs because of its square shape. It has a lot of room inside for people and their things, making it a good choice for families. It can run on regular gas or a special type of fuel that includes some corn, which is what makes it flexible.

Term

flex fuel

"...it says, is it propane or is it gas? Or is it flex fuel?"

Flex fuel vehicles can use different types of fuel, like regular gasoline or a mix of gasoline and ethanol. This means you have options when filling up your tank.

Car

Dodge Grand

"Yes, I did, guys. I did rear wheel bearing hubs on a 2014 Dodge Grand Caravan. And I was wondering if there's any other trick or better way than a slide hammer to try to pop the hubs off that vehicle."

The Dodge Grand Caravan is a family minivan that has a lot of space for passengers and cargo. The 2014 version has features that make it safe and fun for families to travel.

Term

slide hammer

"I was wondering if there's any other trick or better way than a slide hammer to try to pop the hubs off that vehicle."

A slide hammer is a tool that helps pull off stuck parts in a car. You use it to get things like wheel hubs off when they're really stuck.

Part

impact chisel

"Yeah, we use a air chisel, impact chisel and knock them off that way. Where do you push from?"

An impact chisel is a tool that hits hard and fast to break or shape metal. It's useful in car repairs for getting through tough materials.

Part

air chisel

"Yeah, we use a air chisel, impact chisel and knock them off that way. Where do you push from?"

An air chisel is a tool that uses air pressure to help cut or break apart metal. It's often used in car repairs to remove parts that are stuck or rusty.

Part

hub

"Between, we go right between where the hub spins and the spindle itself, not between the knuckle on the vehicle."

The hub is the part of the wheel that connects it to the car. It helps the wheel turn and keeps it stable while driving.

Part

spindle

"Between, we go right between where the hub spins and the spindle itself, not between the knuckle on the vehicle."

The spindle is a part of the car that helps hold the wheel in place and allows it to turn. It's important for steering and keeping the car stable.

Part

knuckle

"not between the knuckle on the vehicle. Yeah, because you'll mar that up."

The knuckle is a part that connects the wheel to the car's suspension. It helps the wheels turn and supports the weight of the car.

Company

Honda

"Honda is one of the companies that were genius when they drilled two holes in all their brake rotors and drums and threaded them so that when they corroded later in life..."

Honda is a car company that makes many popular vehicles. They are known for being smart about how they design their cars to make them last longer and easier to fix.

Car

Ford Explorers

"... is the problem. Ford knows the problem with the explorers if they kept making those models, which caravan ..."

The Ford Explorer is a large vehicle that can carry many passengers and their stuff, making it great for families. It has been around for a long time and is known for being useful for trips and adventures. Some older models have had problems that people should be aware of when thinking about buying one.

Car

Lexus GX460

"Hey guys, I got a 2022 Lexus GX460. It's got 35,000 miles on it."

The Lexus GX460 is a luxury SUV that can handle off-road driving while providing a comfortable ride. It's equipped with a strong engine and four-wheel drive, which helps it drive on rough surfaces.

Term

full-time four-wheel drive

"And this car's got full-time four-wheel drive. My wife drives this, so she got a NAL in the passenger front."

Full-time four-wheel drive means that the car's power goes to all four wheels all the time. This helps the car grip the road better, especially in bad weather or off-road situations.

Term

all-wheel drive

"And just kind of asking, is there a difference between all-time four-wheel drive and all-wheel drive?"

All-wheel drive means that the car can send power to all four wheels, which helps it grip the road better, especially in slippery conditions. It's often used in cars that are driven on highways and city roads.

Term

all-time four-wheel drive

"And just kind of asking, is there a difference between all-time four-wheel drive and all-wheel drive?"

All-time four-wheel drive means that all four wheels of the car are powered all the time, which helps with grip and control, especially in tough driving conditions like snow or mud.

Car

Mitsubishi Outlander

"...the first one is a 2006, 2016, I'm sorry, a Mitsubishi Outlander at 54,000 miles."

The Mitsubishi Outlander is a type of SUV that is good for families because it has a lot of space and is comfortable to drive. It's a popular choice for people who need a reliable vehicle.

Car

Chevrolet Equinox

"And then the other one will be an Equinox, a Chevy Equinox 2015 at 30,000 miles. Both vehicles seem really nice except the Chevy has some sign of rust underneath by the tires."

The Chevrolet Equinox is a type of SUV that is good for families and has a lot of space inside. The 2015 version has different engine options and is known for being comfortable to drive.

Term

CVT

"Is that a CVT in that one, Russ? Or is that a... I don't think so. I'm trying to remember which... It might be. But either way, either way, that's something I would be concerned about."

A CVT is a special kind of automatic transmission that helps the car change gears smoothly without noticeable shifts. It can make driving feel more fluid and can help save on gas.

Term

blown head gasket

"...with basically a blown head gasket. And I looked into it and I took y'all the, and I've already pulled the engine out..."

A blown head gasket means that a part of the engine that keeps fluids separate has failed. This can cause serious problems like overheating and can damage the engine if not fixed.

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