Question about 1992 Cadillac DeVille

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I have a 1991 cadillac deville

I can not get the heat to work It blow air but no heat

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  • darrylsanfor Dec 20, 2008

    1991 Cadillac DiVille with hot heater hoses to the firewall but no heat to the interior.  The fan works but only blows cold air. I expect it is a damper/louver problem.  Are those vacuum actuated?  How do I access them?  ds

  • Anonymous Dec 30, 2008

    I have the same problem but my car will not do anything.

  • Anonymous Jan 10, 2009

    1994 seville itblows but not hot

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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

Posted on Feb 07, 2009

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First of all flush the system. and remember to back flush as well ,and dont break the plastic T while removing it reinstall and you will have, have a great day

Posted on Jan 12, 2009

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SOURCE: 1995 cadillac deville 4.9 eng no heat

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.

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Posted on Jan 22, 2009

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SOURCE: 1999 cadillac deville air wont work

There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.

The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.

Posted on Apr 09, 2009

  • 1 Answer

SOURCE: 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...

Posted on Jan 25, 2011

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Jan 10, 2016 | 1993 Cadillac DeVille

1 Answer

After changing alternator in 95 cadillac deville the heat doesnt blow at all


The alternator does not have anything to do with the blower fan for heat. You may have unhooked a wire by mistake, or you have a blown fuse. God-Bless!

Feb 21, 2015 | 1995 Cadillac DeVille

1 Answer

I have a 1991 Cadillac deville, and when I'm idling, my heat blows hot,but when I start driving down the interstate, it blows cold. I just put a new thermostat in it.


Its possible you've installed the thermostat upside down. If this is not the case, then I think you've got an air bubble in your cooling system. It could work itself out or while the engine is cooled down, you can open the radiator cap and see if its at all low on coolant.

Feb 20, 2015 | Cadillac Cars & Trucks

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The service air conditioner light on our 1991 Cadillac sedan deville 4.9 comes on when I turn the air conditioner on. The electronic climate control will not let me turn on the heat or the ac. It just...


prob a low charge easy to do get R134a from parts store with hose start with about half a can and check it make sure ac is on max when you charge it light should go off

Oct 02, 2010 | 1991 Cadillac DeVille

1 Answer

1998 DeVille: 1999 cadillac deville drver side heat blows hot pa...


The blend door for the passenger side is not connected right or functioning correctly. Try seeing if the dial on the armrest on the passenger side is not rotated one way or the other too much.

May 15, 2010 | 1998 Cadillac DeVille

1 Answer

I have 03 deville my air is working but won't blow out of the vents on the dash


it is usually a vaccum problem, where the air/heat won't switch. but on your car, you have an ac module that can cause this problem, Cadillac should fix this easy and simple.

Aug 29, 2009 | 2003 Cadillac Deville

1 Answer

Heat not blowing 92 cadillac deville


check you fan, or door controls under dash,
leroy

Dec 13, 2008 | 1992 Cadillac DeVille

3 Answers

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...

Oct 18, 2008 | 1991 Cadillac DeVille

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