Air conditioner does not work all the time

CHEVROLET SILVERADO
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99SILVERADO
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  • 1 POST
1999 Chevy Silverado 5.3L - air conditioner works pretty well on open road without much traffic. around town and in traffic it works for a few minutes then blows hot. i turn it off for a few minutes and it will work again. it has been flushed and recharged by tech. new switch has been put on. but same problem exists
Jun 11, 2007 at 7:43 AM
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BRUCE HUNT
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Have you replaced the EFI relay? They are notorious problem causers with syptoms like yours.
Jun 11, 2007 at 8:10 AM
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PAPAWILLYB
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No,I will try that and post the results
Jun 12, 2007 at 1:15 AM
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PAPAWILLYB
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[quote:6b0763223e="papawillyb"]No,I will try that and post the results[/quote:6b0763223e]
Which relay is it?I replaced one and it worked for 4 days.
Jul 18, 2007 at 1:55 PM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Is the compressor clutch cycling on and off? The pcm controls the compressor through a relay. The pcm can shut down the compressor through the relay control, If the pcm thinks the engine is getting too hot. There are other issues that can cause the pcm to not energize the compressor clutch relay. I realize this is an old post. I'm just killing time. lol
Sep 29, 2011 at 1:53 PM
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