Question about 1999 Chevrolet Silverado 1500

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My 1999 silverado the a/c comes on when i'm running the heater, the controls don;t respond when I shut the engine off and restart it, the heat is back on

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  • 54 Answers

The controls dont respond when you turn the engine off ???? engines off not suppose to turn controls, ac comes on..... how do you know are you talking about the ac light or is coming out cold and hot at the same time more info please if u want to temporarily fix issue until summer take ac fuse out

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 1999 1500 silverado heater

Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

Posted on Nov 07, 2008

  • 11 Answers

SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado

you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .

Posted on Feb 28, 2009

  • 2 Answers

SOURCE: Location of heater water control valve for 1999

The right side hose coming from heater core runs into a connector. There is a hose parallel to this connector. At the end is what your looking for. If your wanting to replace this cause your heater doesnt work id recommend flushing your heater core first. My heat didnt work at all flushed it yesturday and works like a charm.

Posted on Dec 17, 2010

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No heat !!! just blows cold air. I think it might be the thermostat. Where is that located on a 1999 Silverado? It is the small V8


could be the heater core valve, check the cable that opens and closes the water valve to the heater core.

check also the setting of the temperature level. it could still be set to cold.

wait for a few minutes for the water to heat up on the radiator. you could have tested it after you start the car and the engine is still cold.

tnx 4 using fixya,

drcool

Oct 08, 2008 | 1999 Chevrolet Silverado 1500

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