Question about Chevrolet Silverado 2500HD

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I have a 2003 Chevy Silverado 2500HD that has been well maintained since purchase. The air compressor was replace less than six months ago by the dealer. Now the AC is blowing hot air. The repair shop says the fan clutch is weak and was not keeping the evaporator core cool antd that caused the high pressure line to blow out. The truck has never run hot, in fact, the temperature does not even raise when idle for 10-15 minutes during the heat of the day. Would a weak fan clutch cause the high pressure AC line to blow out?

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  • pjhatcher Jul 18, 2009

    I probably should clarify, the technician said a valve in the high pressure line was leaking; not that the line blew out. Again, the truck has never run hot!! Also, is it normal procedure to add an inline filter and evacuate the system when replacing the compressor?

  • pjhatcher Jul 18, 2009

    Jeff, thanks for the additional information. I only have one more question and hope you don't take offense. Do you have ASE certification in AC repair and how many years of service do you have in this field? Thanks again for your assistance!!

  • pjhatcher Jul 18, 2009

    Jeff, thanks for all your assistance!


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The answer to your question in my opinion is probably not.I think several reasons support this answer but however anything is possible.You are basically stating a high pressure hose blew apart from subsequent high head pressure as a result of poor air flow. Several anomolies would have to exist for this to be true especially as you are stating no temperature guage or operating abnormalities.Your system will trip off on high head at/or under 400 psi through a compressor mounted pressure switch which is a percentage of the rating of the line set rated at 1500 psi.You would be experiencing interuptions in cooling not to mention temperature gauge problems in this state.I however would not discount the importance of air flow through these coils and the great effect inadequate air flow can have on all systems. Immediate head pressures can develop as result of this and this could be a source for compressor failure or system troubles. The truth of the matter may be the tube was compromised during the replacement procedure of the last compressor.I would inspect the broken line and determine where the break occurred.if the failure occured to any aluminum components near the compressor,this could further support this theory.

Posted on Jul 18, 2009

  • Jeff Barton
    Jeff Barton Jul 18, 2009

    Thanks for the clarification . This happens all to often and alot of schrader valve problems exist but the real problem is the abscence of the service cap which is stated by the factory as the primary seal.These have or should have an o-ring inside and will 100 % positively seal those service ports.A leak of this nature would not neccessitate any filter-orfice/reciever dryer replacement but I hope these items were installed during the compressor change.I would think at this point your scrader valve and cap is servicable without line set replacement.

  • Jeff Barton
    Jeff Barton Jul 18, 2009

    I have factory training in 8 carlines foreign and domestic over 25 year period. Recieved GM training in Okla City OK.- Burbank Ca.-Phoenix Az and Spring Hill TN(Saturn). Master Subaru Technician recieved training in Norman Ok and Irvine/El Toro Ca. ASE Master Tech status and Certified Chevrolet Technician. Ive worked for Oldsmobile-GMC-Chevrolet-Subaru and Saturn service departments as tech,advisor and Fixed Operations Mgr. I left the automotive feilds 4 years ago and currently work on commercial building maintenance including HVAC,refrigeration,commercial kitchen equipment,lighting and computer/phone/alarm networks.


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