Question about 1992 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 when driving car. Help!!!

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Check fan fuses and relays. is the idiot light coming on . stop engin temp. if its coming on unplug it . its located behind the rear valve cover in the middle. if that isnt it replace temp sensor. located below the air breather.

Posted on Mar 25, 2010

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My heat stopped working in my 1992 Cadillac Eldorado what is the problem...


1.COOLING SYSTEM POSSIBLY BLOCKED . SOME TIMES BACK FLUSHING USING A WATER HOSE.
2. FLUSH RADIATOR
3. REMOVE THERMOSTAT
4. REMOVE HEATER HOSES FROM HEATER CORE AT FIREWALL
5. PUT WATER HOSE IN WHERE YOU REMOVE THE THERMOSTAT
6. FLUSH UNTIL CLEAR WATER COMES OUT
7. IF YOU HAVE AN OLD WATER HOSE LAYING AROUND, CUT ONE END OFF AND USING A SMALL SCREW CLAMP ATTACH IT TO ONE OF THE COPPER PIPES, NOT TOO TIGHT
YOU MIGHT DAMAGE IT. THEN TURN ON THE WATER AND FLUSH OUT THE HEATER CORE, UNTIL WATER IS CLEAR.
RE ATTACH ALL HOSES INSTALL NEW THERMOSTAT , REFILL WITH ANTIFREEZE.

Nov 08, 2014 | Cadillac Cars & Trucks

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

1 Answer

I had the water pump replaced. Is there a relay or a valve that controls the heater, or would a thermostat control it???


i didn't see you last posting about your water pump but theres is a tiny radiator called a heater core. it has the same hot water running through it as your big radiator and engine have.so when you turn your thermostat to hot and kick on the fan the fan blows through the heater core and wallaa you have heat you probably need a thermostat.if you have no heat and it is overheating hear and there that's probably what you need.make sure you see if you filled the radiator up all the way when you changed the water pump.

Nov 18, 2010 | 1998 Cadillac DeVille

1 Answer

Replaced waterpump,thermostat,heat sensor ,still over heats


1st check all hoses to the radiator. a hose that you can squeeze easily with little effort may be bad. Replace the 2 large hoses and the 2 hoses to the heater core. It also could be the radiator is clogged. If you remove the radiator and take it to a radiator shop they can clean it out for you for a reasonable price. If it is a plastic radiator you may have to replace it with a new one.

Sep 30, 2010 | 1997 Cadillac DeVille

1 Answer

No heat after new water pump thermo and rad


check valve that lets hot water in to heater core also heater core is in box under dash that has door that opens or closes to block off or let heat in to passenger compartment

Mar 03, 2010 | 1992 Cadillac DeVille

2 Answers

No heat on my 98 caddy deville delegance?


do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

2 Answers

Temp guage showing hot, not getting any heat for 1992 Mercury Cap


If the hoses to and from the heater core are hot , and you say the heater core is hot , then the only answer is that the air duct that flows into or out of the heater core plenum ( housing ) is not opening.
Heater control on dash borad inoperative.
Not sure about 92 capri , some cars have a cable linkage , some work on vacume motors.
Try to find a haynes manual for your car , they will walk you through almost every step of anything you may ever want to do to your car.

You seem to know what you are doing , but I gotta ask ........the heater core you felt was up behind the dash inside the passenger compartment of the car right ?

May 10, 2009 | 1992 Mercury Capri

1 Answer

No heat in 91 Cadillac Sedan Deville


I would beleive more that you have build up in the heater core. Try taking loose the heater hoses from the block and use a water hose to spray into one of the hoses letting it come out the other hose then switch hoses with the water hose and keep reverseing for 2/3 times each hose. sounds like stop leak may have been used in a prior time and may be blocking water flow.

Good luck,
Lugnut61

Jan 30, 2009 | 1991 Cadillac Seville

2 Answers

No heat


cloged heater core........ pull a hose off and run a garden hose to clear it out do it in both directions

Oct 10, 2008 | 1992 Saturn SC

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