Question about 1991 Cadillac DeVille

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HEATER NOT WORKING. ALL FUSES WORK. WHAT COULD BE TE PROBLEM?

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To test those you ohm them out but what if thats not problem could be automatic air control module its about $150 but icouldnt find the old one so good luck

Posted on Nov 13, 2011

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Possibly a relay switch. These are similar to fuses and are found in the fuse area only they are bigger and usually about 1 inch square. Unlike a fuse these are difficult to tell if defective. Need a tester or trial and error replacement. expensive to buy new about $20, cheaper at auto wreckers, only a few bucks each.
good luck

Posted on Dec 11, 2009

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Posted on Jan 02, 2017

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1 Answer

Heater blowing cold air


1. Check coolant level to ensure full, and thus getting to heater core.
2. If that didnt work, With engine hot and running, and heat on in the truck, feel heater core inlet and outlet hoses at the engine compartment firewall to ensure both are hot an thus getting flow. If not the core is clogged or there is a faulty valve in the flow path.
3. If te hoses are hot there is flow thru the core and either your blend door is broken and shut or the blend door motor or circuitry is bad.
4. You tube Ford Ranger blend door for video on how to access behind the glove box. You can fairly easily remove the motor and undoing so check its operation and also the blend door operation.
Likely your motor has gone bad and can be replaced using a low profile socket wrench to remove the 3 Screws holding it in place. I bought a new motor for $40 at One o te auto parts chains locally.
Good luck!

Jan 30, 2014 | 2009 Ford Ranger Regular

2 Answers

WHERE IS THE HORN RELAY LOCATED


Check in the main fuse panel is located on the left side of the
instrument panel. HORN labeled in there; to access the fuses, open the fuse panel door...

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This and other details can find in the Grand Am Owners Manual.

Hope helps Remember comment and rated this).

May 30, 2010 | 1998 Pontiac Grand Am

1 Answer

Heater is not working on 1997 Bonneville when temperature flashes. help? actuater or temp. sensor?


if your lights on the sensor is working, but if its overheating there will be air in te system and won't be any heat,could be alot of psibiities unfortunatly

Dec 16, 2009 | 1997 Pontiac Bonneville

1 Answer

2001 chevy blazer-water under the driver seat and back floorboard,causing the driver seat to quit working.I have no idea where the water came from.Any ideas?


if it has a back heater either a water line to the heater core broke or the heater core for te back heater sprung a leak probabley the heater core on the back heater replace either the hose or the back heater core whatever is leaking.

Jul 28, 2009 | 2001 Chevrolet Blazer

1 Answer

The heater switch quit working, wiper's are fine JUST the


could be the resister tht controls the 4 speeds. It's in te plenum case to keep it cool. Or blower motor is failing

Mar 24, 2009 | 1996 Ford Crown Victoria

1 Answer

1996 Ford Windstar-heater problems


chck te baffle in yor heater it could be stuck open

Nov 24, 2008 | 1996 Ford Windstar

2 Answers

95 jeep cherokee


Your problem is in te combination switch (the light switch that turns the lights on). Replace it and it should be happy again.

Jun 16, 2008 | 1995 Jeep Grand Cherokee

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