Question about 1983 Cadillac DeVille

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Heater core for 83 cadillac deville

I took the car to the shop and got the heat fixed so i thought. they flushed the system out but now there is smoke coming in my car through the vents and smoke coming out from under the hood while i am driving. i just picked it up from the shop. i called back and they said it was the heater core. does anyone know how to change the heater core.. do i have to take the whole dash off? or is it something easy i can get to under the dash?

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  • kfries85 Dec 17, 2008

    yeah i have been looking online to see if i could find the book, but it looks like i am gonna have to buy the book and i was afraid i would have to take the whole dash off...



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If your 83 deville is a coupe like mine then you can access the heater core from under the hood, not the interior of the car. take a look at the blower motor and you'll see that the plastic cover that it is mounted on comes out. under that large plastic cover you'll find the heater core. it takes a while to get all the little screws out, but it's more monotonous than difficult. you'll have to disconnect the blower cables, the temp. sensor and harness, and a few little ground wires and you're there. once you get to the core it's really self explanatory. undo the hoses, replace the core, clean out the piles of pine needles that have accumulated over the years, then put it all back together. if you have the core in hand, then you can replace it in 2 hours if you take your time. hope this helped. let me know if you have any troubles.

Posted on Feb 04, 2009

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I am afraid you will have to remove the dash, Sorry to have to tell you but this is a very big job to try and do yourself. I can help find the directions, but it is not a job for the faint hearted.

Posted on Dec 15, 2008

  • David Johnson
    David Johnson Dec 17, 2008

    Hey, one thing yu can try, that might save you from all this is a product we use to call red pepper, available at many autoparts stores. yu put a couple of packages in your radiator and it many times will stop a leak in the heater core. It has worked for me many times in the past, good luck to you



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Why is my 2000 cadillac deville overheating but not smoking

I bought a 2000 caddy Deville off the side of the road, had a 800.00 sign on it, pullover to see it, a man came out and said he had it to four shops and they can't figure it out. gave 700.00 for it and had to tow it home., flushed radiator, heater core, and engine out, changed thermostat, checked water pump. this Northstar engine would over heat when driving it. Turned out to be the plastic cover underneith, it hooks to the front bumper and goes to the metal frame to block the wind. when it is missing, the wind blows in and back drafts the radiator so the fans can't do their job and cool the motor. a five dollar cover from the junkyard and it was fixed, crazy hu. I hope this helps someone.

Jun 27, 2011 | 2000 Cadillac DeVille

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My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.

Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.

Remember to install sealant after flushing out the system to prevent leaks.

Jan 25, 2011 | 1992 Cadillac DeVille

1 Answer

My heater dont work it blow out air but there very lil heat

Check whether the heater core is clogged by feeling the two tubes at the firewall that lead to the heater core. If they are cool rather than hot when the car is at normal operating temperature, the heater core will have to be flushed out, or replaced.

If the two tubes at the firewall are hot, but the interior doesn't get heat, then a blend door problem may exist where it is at the wrong angle due to a faulty vacuum motor, or control for the vacuum motor.

Good luck on getting heat inside of your 1998 Cadillac Deville.

Jan 21, 2011 | 1998 Cadillac DeVille

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Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

Jan 16, 2011 | 1976 Cadillac Deville

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My heater doesn't work. The blower comes on but no heat. Regardless of the setting (60-90 degrees) only cold air. Defrost works to clear windows but no heat.

Most likely your heater core has been clogged up with years of contaminants. The fix here is to pull the heater core, have it flushed or replaced, and put it back.

Dec 25, 2010 | 1994 Cadillac DeVille

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Heater blows cold air, also defrost blows cold

check to see if your hoses to heater core are hot on both sides. my 93 hoses where hot going in the heater core but not out. I flushed the heater core now I have heat

Dec 12, 2010 | 1993 Cadillac DeVille

2 Answers

Flushing a radiator is basically removing the pedcock value and running a large amount of coolant through the system?

Purchase a tee made by Prestone at any auto parts store. Install the tee to the heater hose and flush it by their instructions. This way you also will flush out the heater core as well. Flushing the way you describes only gets the job halfway clean

Mar 27, 2010 | 1998 Cadillac DeVille

1 Answer

What does a heater core do?

The heater core runs off of the cooling system, it is a small "radiator" behind the dash that sits in a box. when the heater core is full of hot coolant, it gives off heat and the blower motor pushes the hot air to the vents.

If a heater core ruptures, becomes clogged with parasites, or gets blocked in a hose (the 2 leading to the firewall under the hood on the passenger side) it causes the car to overheat, and/or leak.

my suggestion is to have the system pressure tested, and flushed if it checks out OK

Mar 19, 2009 | 1988 Cadillac Seville

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No heat 97 deville-

Have your heater core backflushed. These vehicles use DexCool and they clog up terribly. The DexCool antifreeze does not mix with anything so you will need to flush the system. Hope this helps.
RPM Northwest

Jan 27, 2009 | 1997 Cadillac DeVille

2 Answers

I have a 1991 cadillac deville

I have a 92 Deville. All the flushing in the world will not fix the cloged up heater core. The flush will clean out the passenger side of the core but will not clean the core on the drivers side. I have just repaced my core and seen how these fail, It is a bad design that caddys are known for. It was recomended I do a total flush of the system every 30,000 and then just maybe I would not have to endure the core change again. As the antifreeze runs through the car it does a chemical change due to all the different metals and rubber it flows through. since the heater core is small with small bands to let the coolant in and out, it builds up with the sludge from the chemical change. Thus closing off the drivers side first. Note, both the inlet and outlet are on the passenger side, you really cant flush fluid where it builds up the sludge in the core. Solution, new core after trying a flush

Dec 18, 2008 | 1992 Cadillac DeVille

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