Question about AC Cars & Trucks

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My heater and defrost and ac don't work on my 99 Bonneville.when I turn on I hear a click noise but no air comes out. The car was sitting for 6mths before I got it. What do u think could be wrong?

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  • AC Master
  • 12,537 Answers

Blower motor maybe ! Did you switch from low to hi speed to see if any speeds work ? Before replacing parts testing the electrical circuit is how to find the problem ! There are videos on youtube showing how to test .

Posted on Dec 06, 2016

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Heater on 02 galant

it is the heater control valve that is located next to your glove box the control valve has a motor atached to it take your glove box out and the lower part of the dash
then you can get to the part to replace it (Dealer item only ) around $150.00

Posted on Oct 16, 2008

  • 60 Answers

SOURCE: heater only blows hot air when pressing on the gas pedel.

that is most likely caused by a lack of coolant flow thru your heater core, have your local repair facility ( or yourself if you are able) flush the heater core.

They only need to flush the heater core, this is no the same as a coolant flush as that puts very little pressure on the heater sore and will not be sufficiant to dislodge any debris in the heater core.


Posted on Nov 22, 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

  • 62 Answers

SOURCE: clicking noise behind ac /heater control on dash

the problem is with the blend door it controls the blend of hot and cold air. there is a small electrical motor that can go bad or they can hang up
you will probally have to take some covers off to find out whats going on

Posted on May 14, 2009

jgwhomeequip
  • 1902 Answers

SOURCE: 1998 Buick Regal GS: HVAC problem. Air does not

Your vent relay switch is bad and you will need to replace it. It is located underneath and behind the glove box.

Posted on May 31, 2010

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1995 GMC pickup. Cold AC will blow through all settings (defrost, front vents and flloor) but warm air will not come out the defrost. You can hear something click in the dash that you assume is some kind...


good work, the clicking noise you hear is the blend door trying to move. this door is what controls the temp. the most common reason is the actuator motor is bad but sometimes the door hinge breaks, this hinge slides into actuator and is used to move the door. you will need to locate it on the heater box by locating the noise and then remove the actuator and see if the hinge is broken, i will try to enclose some picture to help you. good day, hope this helps.johnjohn2_142.jpgjohnjohn2_160.gif

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My air conditioner or heater no sure is clicking alot when i turn the heater on how do i fix it


Lift the hood and watch AC compressor, you will probably see that engaging, and disengaging regularly when defrost is on. ( that is probably your clicking sound your hearing) The AC coming on while in defrost mode, is normal, as it aids in removing moisture, thus defrosts faster. If it appears to happen too often, you may be low on freon, otherwise, you can shut engine off, and remove connector at AC compressor, but be aware, it won't defrost as fast, or as efficiently. If you do remove that connector, I'd advise every once in a while to put it back on for a day or so, to keep the compressor from seizing up. The proper thing would be to have AC system checked first.

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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.

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Heater control wont heat. AC and fan works fine


mechanical or vacuum operated valve that releases hot coolant into the heater core may be stuck closed. or the heater core may be clogged. hope this helps.

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