AC problems!

cathys0715 · #1 09-07-2005, 08:04 PM

Hi All,
I've searched this forum and can't find the answer to my problem...so here it goes.
We bought a 95 Blazer LT 4x4. AC runs hot so took it to the mechanic. It had too much freon in it so they vacuumed it and put the correct amount in. Still not working. The mechanic thinks it may be an electrical problem somewhere. He ran out of time and wants me to bring it back so he can "trace wires".
My husband looked at it, the compressor is not kicking on at all. There is apparently a censor that will keep it from kicking on if the freon level isn't right....but the mechanic did fix that. Husband also said the clutch that is mounted to the compressor in not engaging. So, I'd love to get some opinions before we go pay another $70 for diagnosis. My husband fixes A LOT of stuff on our vehicles and he'll read your replies to see if he can tackle this one (I pray so!)!
Thanks in advance!!

Jeremy Fitch · #2 09-07-2005, 08:10 PM

Quote:

Originally Posted by cathys0715

Hi All,
I've searched this forum and can't find the answer to my problem...so here it goes.
We bought a 95 Blazer LT 4x4. AC runs hot so took it to the mechanic. It had too much freon in it so they vacuumed it and put the correct amount in. Still not working. The mechanic thinks it may be an electrical problem somewhere. He ran out of time and wants me to bring it back so he can "trace wires".
My husband looked at it, the compressor is not kicking on at all. There is apparently a censor that will keep it from kicking on if the freon level isn't right....but the mechanic did fix that. Husband also said the clutch that is mounted to the compressor in not engaging. So, I'd love to get some opinions before we go pay another $70 for diagnosis. My husband fixes A LOT of stuff on our vehicles and he'll read your replies to see if he can tackle this one (I pray so!)!
Thanks in advance!!

The switch you are speaking of is the low presure switch. You can pull the plug on this switch and jump the 2 connections over with a peice of wire, just stick each end of a short wire into each side of the plug, and see if the compressor kicks on. If it does then the pressure switch is bad.

cathys0715 · #3 09-07-2005, 08:13 PM

Thanks for the quick reply! Husband is going out to see about that right now!
Cathy

cathys0715 · #4 09-07-2005, 08:17 PM

Husband needs to know, is the low pressure switch located in front or on the back of the compressor?
Cathy

s10blazerman4x4 · #5 09-07-2005, 08:25 PM

Are there any wires on the accumulator itself?Not sure as to location of that switch as no parts show for that year vehicle on autozone but on my 91 i have a connector on the accumulator

cathys0715 · #6 09-07-2005, 08:30 PM

Quote:

Originally Posted by s10blazerman4x4

Are there any wires on the accumulator itself?Not sure as to location of that switch as no parts show for that year vehicle on autozone but on my 91 i have a connector on the accumulator

He said there are two plugs on the compressor itself...one in the front and one in the back. There is also a plug and wires on the accumulator itself. What's his next step?
Cathy

s10blazerman4x4 · #7 09-07-2005, 08:38 PM

http://www.automotiveforums.com/vbul...ressure+switch

http://www.automotiveforums.com/vbul...ressure+switch

http://www.automotiveforums.com/vbul...ressure+switch

s10blazerman4x4 · #8 09-07-2005, 08:41 PM

http://www.automotiveforums.com/vbul...ressure+switch

97BlazerDude · #9 09-07-2005, 08:46 PM

You want to jumper the round switch on the accumulator. Have the AC on MAX. Jumper the sensor on the wire, not the contacts on the accumulator.

cathys0715 · #10 09-07-2005, 08:47 PM

Eureka! He found it, thanks to yall! It's the accumulator switch. The clutch kicked on when he put the screwdriver to the connector part...does that make sense? Anyway, he said that's what it is...now just to get the part from Autozone!
Cathy

s10blazerman4x4 · #11 09-07-2005, 08:48 PM

Quote:

Originally Posted by 97BlazerDude

You want to jumper the round switch on the accumulator. Have the AC on MAX. Jumper the sensor on the wire, not the contacts on the accumulator.

Good thing you know for sure i threw them threads out there because it talks about that in quite detail

cathys0715 · #12 09-07-2005, 08:49 PM

Quote:

Originally Posted by 97BlazerDude

You want to jumper the round switch on the accumulator. Have the AC on MAX. Jumper the sensor on the wire, not the contacts on the accumulator.

Oh no, he just said "not to the accumulator but to the connecting wires"
When he put the screwdriver THERE the clutch kicked on.
Cathy

s10blazerman4x4 · #13 09-07-2005, 08:49 PM

Anytime i can help a Southern it makes my day.We will rise again.

cathys0715 · #14 09-07-2005, 08:52 PM

Quote:

Originally Posted by s10blazerman4x4

http://www.automotiveforums.com/vbul...ressure+switch

Thank you!! This is exactly what made the fan clutch kick on...so please help us out some more....what is the NAME of the part that needs replacing? Accumulator switch or sensor wires...or what?
Cathy

cathys0715 · #15 09-07-2005, 08:54 PM

Quote:

Originally Posted by s10blazerman4x4

Anytime i can help a Southern it makes my day.We will rise again.

Haha! I am really a Texan...geographically in the South but not all SOUTHERN

But I am sure yall will rise again anyway

Seriously thanks for the quick replies
Cathy

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