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lanegirl
New User
Jun 29, 2007, 10:57 AM
Post #1 of 5
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2005 GMC A/C not cooling
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I have a 2005 GMC Sierra. The A/C blows, but does not cool. My husband tried to recharge it thinking that was the problem, but it was fully charged. Does anyone have a suggestion as to what to look for next? Someone said to check the Cycling Switch, but I have no clue where that is. Can someone please help, my husband is out of town and the Arizona heat is killing me!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 29, 2007, 5:32 PM
Post #2 of 5
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Re: 2005 GMC A/C not cooling
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How was it determined that it was fully charged and was any more refrigerant added? This is critical info to move on and in fact get both high and low pressure readings,
T
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lanegirl
New User
Jun 29, 2007, 6:08 PM
Post #3 of 5
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Re: 2005 GMC A/C not cooling
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My husband put some gauge on it and it said it was fully charged, and nothing was added.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 30, 2007, 7:14 AM
Post #4 of 5
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Re: 2005 GMC A/C not cooling
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I'm guessing that it was checked with one of those cheap gauges that only measure low side pressure and could say "full" but they are so inaccurate and lack good instructions they are about useless. You need to know if the compressor was engaged when a reading was taken or if just put on with compressor off it was just telling a static pressure which should be the same as the ambient temperature in F. i.e. If it was 90F out the gauge would read 90 and if lower than that the system is about empty.
The majority of reasons why A/C doesn't blow cool air is low refrigerant charge. The problem is usually that it leaked as stealing it out of your car wouldn't be that easy. It needs to be determined how much is in there and a real gauge/manifold set is the best clue. Even those can't say how full the system is but can tell how well it is operating and lead to the likely cause of a problem. Don't just add refrigerant ever!!!! without more information as adding too much can destroy a system or worse, hurt you with a blowout of overpressure.
First you need to know if the compressor is engaged. The outer hub of the compressor will be still when it is not engaged and spinning at the belt speed when it is engaged.
How far do you or a helper want to go with this? Even with some investment in equipment you can easily still need a shop to get you fixed up properly. Yes, it's an expensive trade now with tons of equipment and tools needed to do comprehensive work on A/C. Let us know,
T
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 30, 2007, 7:19 AM
Post #5 of 5
(1462 views)
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Re: 2005 GMC A/C not cooling
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Forgot to mention that I have friends in the A/C biz big time in Phoenix if you need service or parts if that is close to you. Let me know if that's an option you wish to persue,
T
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