Question about 1999 Chevrolet Silverado 1500

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A/c blows hot hot air..no matter which way knob is turned. Fuse,switch, or what

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Check the HVAC relay under the hood for +12 volts if you have it here, then check the compressor clutch coil for +12 volts,then check the low pressure switch on the receiver on the passenger side of the engine compartment by jumping the switch and see if the compressor starts,then if you can hear the clutch engage and the compressor starts then you are low on R-134a refrigerant and need to find the leak or top it off with an a/c recharge kit,but be careful not to add too much refrigerant

Posted on May 15, 2010

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Posted on Jan 02, 2017

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SOURCE: the heater only blows hot air

You didn't mentioned the model year of your Ford, but you might try lubricating the heater control switch which is located in the engine compartment side against the firewall. If you have someone try to move the temp knob inside while you look in the engine compartment, you might find the control valve. Once you find it, check to see if the cable is still connected, then try lubricating it with some WD-40 at 1st to get it sliding like it should. Once the cable is opening and closing the valve like it should, you will notice the temps adjusting like they should. Good luck!

Posted on May 08, 2009

mrdevildog
  • 37 Answers

SOURCE: My temperature control knobs will not let me turn

sounds like you have a blend air door problem or a a/c system problem, need to check both, you can check the blend air real easy, turn the key on, lay down on the passanger side floor and look up behind the dash, you should a white colored square box in your face, will have wires going to it, turn the temp control back and forth and see if the shaft on the blend air door motor is turning, you will notice any problems with it like sticking, binding, weired sounds coming from the motor, if that checks out good then you might want to check uot your a/c system, could be low on freon or have a component failure which will not turn the a/c on and blow cool air.

Posted on Feb 23, 2010

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