AC problems!

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!!

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.

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

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

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

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

http://www.automotiveforums.com/vbulletin/showthread.php?t=123129&highlight=low+pressure+switch



http://www.automotiveforums.com/vbulletin/showthread.php?t=168220&highlight=low+pressure+switch



http://www.automotiveforums.com/vbulletin/showthread.php?t=287607&highlight=low+pressure+switch

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.

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

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

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

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

http://www.automotiveforums.com/vbulletin/showthread.php?t=419364&highlight=low+pressure+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

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

http://www.autozone.com/servlet/UiBroker/?UseCase=C001&UserAction=answerRequiredQuestion&Parameters=%7C%7ELOW+PRESSURE&PageSync=2


Type in A/C Switch Pressure Cut OUt I dont know how many terminals you got i think 2 so thats what the link is for then go low then your there

Yeh i just saw it said Charlotte and im like sweet racing and a southern and even though im in Pa the South will rise again.I drive around w my 2nd National flag flying proudly and my dixie horn and my david allan coe

Ok thanks yall! He'll have this fixed in the morning. To the one who replied about the accumulator thing,Blazerdude, I think...that is what it was! So thanks! We found the part on Autozone, thanks to s10blazerman! I am sure my husband will be visiting this forum frequently! Hopefully not because we are having problems with the blazer though!
Cathy

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.
Sorry, we can't find the right part on Autozone! It's not the low pressure switch, it's the switch on the accumulator. Does anyone know what that is called, exactly. Or just replace the accumulator altogether? Sorry I keep asking more questions! New problem to us!
Cathy

Come to the offtopic thread thats where we have to talk about non blazer things.Lol i just did a search

http://www.napaonline.com/cgi-bin/ncommerce3/ExecMacro/NAPAonline/search_results_kw.d2w/report?search_string=AC+Low+Pressure+Switch&org_string=low+pressure+switch


Probally have to order it,check wire colors how many terminals then order it,my last post did not go through

It's called the clutch cycling switch.

Thats what i thought when i was looking for a link for her.But on napa if you follow there questions you will get the part you seek.

It's called the clutch cycling switch.

Thank you, found it last night at Advance Auto Parts and picked it up today. $16 problem...easy fix.
Thanks for everyone's help!
Cathy

Nice and cold now, i assume