Question about 1999 Cadillac DeVille

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No heat 1999 cadillac deville - 1999 Cadillac DeVille

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Posted on Jan 02, 2017

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  • 24 Answers

SOURCE: Very Simple problem. I have

Check / change the the cooling system thermostat. If the thermostat is not opening then the hot coolant can not flow to the heater core. $11.00 at Rockauto. http://www.rockauto.com/catalog/raframecatalog.php
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Posted on Nov 30, 2008

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SOURCE: 1999 Caddy Deville A/C problem

A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...

Posted on Aug 13, 2008

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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

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SOURCE: thermostat location on a 1999 cadillac deville concours

looked it up online and looks like it's on the front of the water pump in a thing called the coolant inlet housing. one end of it looks something like the letter y and the other end, where the thermostat is round. hope that helps

Posted on May 30, 2009

  • 1608 Answers

SOURCE: 1999 Cadillac Deville Driver side power seat not working

No fuse.These seats are protected with relays and a seat module.The module is under the drivers seat.There are 3 connectors and it would be hard to check all these wires for power to the motors.First look under the seat and make sure none of the connectors came apart under the seat by something that might have been left or rolled under it.The 2 main ones you can check are the connector 2 terminal C and connector 3 terminal A.C is a black wire which is ground and A is a red wire which is the feed power wire.Connector 2 is green and 3 is black.If the ground and power wires are good then you could have a bad drivers seat module.What I would do is go to the salvage yard and find a used module to try.Good luck.

Posted on Dec 07, 2009

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1 Answer

My heat doesn't work on my 1999 Cadillac Deville


Start with the basics, check to make sure you have thermostat, h And the heater hoses. On a lot of the older cars. This would help prevent the older car from over heating. Just a suggestion.

Sep 22, 2013 | Cars & Trucks

1 Answer

Intermittent heating and air fan in 1999 cadillac deville.


check the connector on the speed resister they overheat and loose contact

Sep 10, 2012 | 1999 Cadillac DeVille

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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

No heat on right side of my 1999 cadillac deville


Most likely, under the dash, coming off of the blower housing, one of the ducts has come loose.

Feb 10, 2010 | 1999 Cadillac Seville

3 Answers

1999 Cadillac Deville Heater Blower motor has quit. How do I determine whether it is the blower motor or the controller?


make a jumper cable up from lamp cord (from any Hardware store) and power up the blower motor from the battery

Jan 18, 2010 | 1999 Cadillac DeVille

1 Answer

My 1999 Cadilac Deville over-heats.


Check to see if your fans are coming on and if not check the fuses and relays.............

Jun 26, 2009 | 1999 Cadillac DeVille

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