Question about 1999 Chevrolet Silverado 1500

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When you change from heat to air , it still blowes hot air like it is not switching to air conditing, the compressure is running and lines get cold, but no cold air. thanks

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  • 228 Answers

If the orifice filter is clogged, this will happen, a better check can

be done with an ac manifold gauge set, the low side reads the

evaporator pressure and the high side reads the discharge

pressure. I had the same problem while checking the ac on a

2000 gmc 1500 z71 4x4. other things that could cause this are

to much oil in the ac compressor or not enough freon in the

system. an overcharged system , the best way to check it is with

a gauge that way you can tell if you have the right amount of freon

and oil in the system. plus the gauge set will let you know the

extent of your problem. good luck!

Posted on Apr 09, 2011

  • realty_assoc Sep 15, 2011

    That is wrong advice....the problem has nothing to do with the orifice or anything at all to do with the freon systems; the problem is a bad "HEATER AIR DOOR BLEND ACTUATOR".....this will fix the problem or a temporary solution is to put a manual valve (ie. from Home Depot plumbing aisle) inline in the inbound heater hose so you can shut off the inbound hot coolant from going into the heater core....

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