Question about 1999 Chevrolet Silverado 1500

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My air conditioner will cool for about 5 minutes then starts blowing warm air. i have replaced orphus tube and all filters. when it starts blowing warm air i get a wet dirt smell in the cab. is it my evaporator core or what?

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I think you are right. The core may be restricted or leaking refridgerant. The moisture could be condensation on the evaporator that is building up inside because of a plugged or broken drain hose. (the water you see on the ground under a car when the A/C is running might be dripping inside the cabin)

Posted on Mar 17, 2011

  • Thomas 35 Jul 22, 2011

    try pinching off one of the hoses going to your heater core. even tho the heat setting is off it could still be leaking hot water thru your heater core which will decrease the efficiency of your evaporator and thus your airconditioning system. tdlegrand3@yahoo.com

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
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