Question about 1996 Oldsmobile Ninety Eight

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Heater and defroster and A/C do not work

When turn on defroster no air comes out.

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  • Anonymous Apr 01, 2009

    99 saturn sl1 heater not getting hot ,blower works

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Check your fuses or go to an auto parts store and ask them to check for you!

Posted on Jan 20, 2009

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2 Answers

1986 Chevy Nova - the defroster/heater vents stopped working. Any ideas? Before they found the found the fuel filter, they messed with the air filter. Could that be the problem?


If the air vent mode doors are vacuum operated, (though some are cable operated), they could have disconnected a vacuum line from engine. A vacuum diagram sticker should be located under the hood. The a/c hose will be listed as (HVAC hose).

Jan 15, 2014 | 1986 Chevrolet Nova

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Heater and Defroster not blowing air


check vent flaps inside the blower unit....

Nov 24, 2013 | 1996 Mitsubishi Mirage

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1996 Montero Heater Blower not working


I assume your heater setting is electric control, if so either your defrost and floor heat switch failed or wire problem. For the air not hot, check the heat control valve on the top of the hose it should be in front of the firewall. I don't know your car is using mechanic valve or electric control valve. Anyway check there first. Good luck.

Nov 24, 2013 | 1996 Mitsubishi Montero

1 Answer

Why doesnt cooling fan come on with heater on but comes on with defroster on a 1996 ford thunderbird


The cooling fan should come on when the coolant temp reaches around 200 degrees F. regardless of what position the heater switch is in.

The fan comes on when the defrost is on because the defrost automatically turns on the A/C. The A/C dries the incomming air to help clear the windshield.

Aug 21, 2012 | Ford Thunderbird Cars & Trucks

1 Answer

The heater works but when the defrosters are


The Air conditioner compressor is seizing when the compressor clutch trys to engage. When you put on the defroster the air conditioner automatically comes on to take humidity out of air.

Jul 24, 2010 | 1996 Plymouth Breeze

1 Answer

Front defogger blows out heater vent when set on DEF. All of the heater, a/c, settings work properly. One day, I turned on the DEF and the warm air blows out of the heater vents, not the defroster area. I...


Sounds like the flap valve in your vent system that allows air to go to the defrosters is either jammed or broken. Unfortunately you will have to take the vent system apart to look.

Nov 05, 2009 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Ac compressor goes on an off,even when the a/c is off... The heater works fine ..... The a/c works occaiconally....The system has been filled 2 months ago.... No leakage...... The compressor always stops...


Most cars and trucks are set for the A/C to run in defrost. Even if you have the temp at hot. The air will pass through the evaporator core first witch draws moisture out of the air. That is why you see water dripping out of a car with the air on and sitting at one place.

The dry air makes the defroster work faster. It is a safety feature.

Aug 27, 2009 | 1998 Chevrolet Tahoe

1 Answer

Air vents and defroster


replace the vacuum mode control switch in the heater control, this is a dealer only part.

Mar 22, 2009 | 1999 Ford Expedition

1 Answer

Heater works ok but wont send air thru defrost vents


check the control knob it may appear to be working but is not turning the actual controller

Jan 01, 2009 | 1995 Pontiac Grand Am

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