Question about 1992 Cadillac DeVille

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1992 Cadillac deville heater bypass

Hi, i know i need a new heater core...but 2 temp. solve the problem so i dont have leakage or smoking i would like to bypass the heater core...do you know any good diagrams that would help online? or could you tell me the easiest way to do so?

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  • Anonymous Mar 12, 2014

    a diagrame on how to bypass the vatts system wirring system for a 1992 cadillac deville i am only running in circles healp plz.

  • Anonymous Mar 14, 2014

    need to bypass heater core on 2000 cadillac deville

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The easiest way to by-pass the heater core is to take off both hoses at the fire wall and use a piece of hard tubing to insert in both hoses and use hose clamps it's quick and easy and should get you by. make sure you top off the coolant and do this with engine cold.

Posted on Aug 28, 2008

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3 Answers

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

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How long does it takes to replace a heater core in a 1998 cadillac deville


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We have a 1992 Cadillac DeVille - the motor has been replaced, new radiator new water pump, new hoses, theromsat - has no heat to the heater core - car does not get hot when at idle - but does overheat...


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Feb 02, 2010 | 1992 Cadillac DeVille

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My 1996 Cadillac Sedan Deville heater blows cool air and engine is running at normal temps. It never seems to get up to temperature.


If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core

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if you put a 160 degree thermostat in it or lower it will not get hot you need at least a 190 a low temp thermostat is only good in the summer i bet that will solve your problem

Oct 26, 2009 | 1994 Cadillac DeVille

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Heater cores out


Take both heater hoses off and hook them together with a piece of pipe and a couple of hose clamps.

Apr 08, 2009 | 1996 Cadillac DeVille

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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.

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