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2002 chevy trailblazer_ls
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Discussion Starter · #1 ·
2002 Chevy Trailblazer....inline six cylinder...dual climate zones.


It takes several (5-10) miles for the a/c to start blowing cold. Once it is cold, everything is ok. It seems like this happened when we bought it in '02 and they replaced a some sort of pressure switch. I no longer have the service records..has anyone seen this before?
 

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2004 gmc
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Have you had the pressures checked by a professional AC shop?

There was an updated fan clutch in 2005 that addresses part of this problem, and aftermarket ones are available for $150-200 if you're handy. Run a search for how to swap it.

GM also came out with a software update for the PCM programming, normally only available from the dealer, to increase the fan speed at initial startup when the engine doesn't need cooling but the AC condenser does. You might benefit the most from this software update.

When you first start it up, before you drive off, is the receiver/dryer (the silver can by the passenger side in front of the firewall with the octagonal top) very cold? It should get to 36-40 degrees within a minute if you have proper refrigerant pressures.

Oh, all trailvoys have dual zone (driver/passenger) systems, the interesitng difference is if it's digital or manual controls, but that actually doesn't matter to your problem at all.
 

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2002 chevy trailblazer_ls
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Discussion Starter · #3 ·
I bought a gauge set and the pressure is reading 28 psi at 95 degree ambient. The charging chart says that is should be around 45-50 psi at this temp.

Anyone have experience in charging their own system?

Air coming out of the dash vents was 57.5 degrees...seems like it used to be colder than that, maybe somewhere around 40 degrees.
 

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2002 chevy trailblazer_lt_ext
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Most likely you have a leak in the A/C System. Your best bet is to take your truck to an Automotive A/C Shop and have them find the leak, repair and re-charge refrigerant.

You can find the leak yourself, but you will have to buy the dye, and an UV light/glasses. Probably cheaper to have someone else that already has the equipment do it for you.
 
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