Question about 1996 Cadillac DeVille

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1998 Cadillac Deville Heater blows cool, Semi-warm at any setting ( except low, Air does work )

Air Cond. was all replaced two years ago,(pump,condensor, hoses,)also Radiator, Blower last year. Controls seem to be working,they change from heat to vent to defrost.These repairs were not done because of this problem,this is a recent problem.If this was an older car I would say the Heater ,water valve, was not opening all the way. I know there is an air blend door. the lever I see looking up under glovebox from the floor on the passenger side moves. Would I get some kind of codes, and if not, could the heater core be only partially plugged?

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  • Rob Kent
    Rob Kent Jan 21, 2013

    Blower works fine, As i stated ,it was replaced a year ago and is working.( All speeds )

  • Rob Kent
    Rob Kent Feb 19, 2014

    Forgot to mention the entire engine was replaced Nov. 2010, so no corrosion problems.I think its the blend door. How much of a pain is it to fix?.

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  • 165 Answers

THERE IS A RELAY CONNECTOR THAT GOES TO THE BLOWER AND THAT CAN BE REPLACE AND THAT WILL PICK UP ALL 1234 SPEEDS THEY ALWAYS TEND TO GO OUT IN TIME

Posted on Jan 15, 2013

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: 1999 cadillac Deville cold air blowing out passenger side vents

Sounds like a Blend door issue, but could be the controller switch, Test ALL modes of operation to see what works and what does not. That should narrow it down a bit. The Blend doors are flap/ doors that regulate air flow, newer vehicles are plastic - electric assemblies ...prone to failure. Any clicking or thumping noises during switching modes and on-off suggest a bad Blend door. Hope that helps...good luck

Posted on Jan 12, 2009

blueextc3221
  • 15935 Answers

SOURCE: no hot air from heater, blower runs fine

The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.

Posted on Jan 21, 2009

alicantecoli
  • 22095 Answers

SOURCE: no heat on passenger side and warm air on drivers side

heater radiator blocked or partially blocked,drain antifreeze and save ,remove the inlet and outlet pipes for teh heater and flush in both directions repeatedly .brown rust should come out,if not a lot comes out then fit two pieces of pipe about a foot long to heater unit pipes and mix some caustic soda and pour in one pipe with a funnel till it comes up in other pipe leave for a while then flush again and you might need to repeat this two or three times

Posted on Dec 16, 2008

  • 137 Answers

SOURCE: Heater/blower shuts off after car warms up

those have a part called the programmer that controlls heater a/c function its most likely the cause.. it located unter the heater box on pass side

Posted on Feb 04, 2009

  • 1 Answer

SOURCE: air cond warm coming out of driver side dash,warm passenger side

you want me to post a free solution yet want to charge for info I requested for free?

Posted on Jun 19, 2009

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1 Answer

1997 Cadillac Deville can I still drive the car if it says very low refrigerant


If you are talking about refrigerant for your air conditioner than yes you just won't have an air cond. If you are talking about refrigerant for your motor than NO you'll blow the engine

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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.

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try backflushing the heater core,remove heater coolant hoses and flush both ways with a garden hose,do you have a air compressor ,blow water back through heater core both ways,this asuming that all valves are working allowing coolant to flow and all air doors in car are opening,if so this fix has worked many times for me in older cars note works better to hook water hose to hoses or a short peice of hose on heater core,good luck

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Nov 03, 2009 | 1994 Cadillac DeVille

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If it's a nice car, get a new compressor installed. If it's borderline- get rid of the car.

I paid 2200 to Cadillac to fix the A/C and climate control only to have the transmission fail in my '93.

I dumped the car soon thereafter....

May 27, 2009 | 1996 Cadillac DeVille

1 Answer

My 91 cadillac devile has no heat , just cool air blows even when


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 14, 2009 | 1991 Cadillac DeVille

1 Answer

No heat on passenger side and warm air on drivers side


heater radiator blocked or partially blocked,drain antifreeze and save ,remove the inlet and outlet pipes for teh heater and flush in both directions repeatedly .brown rust should come out,if not a lot comes out then fit two pieces of pipe about a foot long to heater unit pipes and mix some caustic soda and pour in one pipe with a funnel till it comes up in other pipe leave for a while then flush again and you might need to repeat this two or three times

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1991 cadillac deville NO HEAT


I had the same problem in my 1991 caddy, and turned out to be the blend door. It is located in back of the glove compartment. There are two kinds, the automatic blend doors and the manuel ones. Since the temperature is automatic and programmed to stay where it is set, it would be an "automatic blend door". Not a hard fix...

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1 Answer

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1. Have the refridgerant fluid level checked. (Could be low)

2. Have you tried putting it on recirculate? Could be a venting issue.

Other than that it's out of my league.

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