AC went out!!! Experts inside please.
Mar 10, 2010 | 04:03 PM
#1
Thread Starter
Joined: Sep 2007
Posts: 5,883
Likes: 2
From: Crowley, TX
AC went out!!! Experts inside please.
My compressor just all of a sudden stopped turning on. I went to get it charged and they said it's not taking in any coolant? I checked all the fuses/relays in the truck and under the hood and they're good. What else can I check? It's starting to warm up here in TX
Mar 10, 2010 | 04:33 PM
#4
turn your ac on and check if the clutch is energizing with a volt meter should have 12 volts if you got voltage on the compressor and compressor is not pumping then its a failed compressor or clutch.. need to replace
if you dont have 12 volts at the compressor then it could be (1) fuses
(2)low charge very common problem, refrigerant is low the system is equipped with a low pressure switch witch means if the system is low on refrigerant it will kill 12 volts to the compressor to protect it,sometimes you have to jump out the switch to charge the system(3)could be a bad switch the one that turns on the ac
if you dont have 12 volts at the compressor then it could be (1) fuses
(2)low charge very common problem, refrigerant is low the system is equipped with a low pressure switch witch means if the system is low on refrigerant it will kill 12 volts to the compressor to protect it,sometimes you have to jump out the switch to charge the system(3)could be a bad switch the one that turns on the ac
Mar 10, 2010 | 04:41 PM
#5
In my experience if the compressor is not locked up it is usually the low pressure switch located on the dryer/evaporator under the hood. You can unplug this switch and jumper it to see if the compressor kicks on or not to narrow down the problem. Also, if the bottle of R134-a is large enough (we use 30lb bottles) and has enough gas in it then it should have enough pressure to push the gas in without the compressor having to be on so I dont know what they mean by "its not taking a charge" unless they are using those little cans.
Mar 10, 2010 | 04:45 PM
#6
In my experience if the compressor is not locked up it is usually the low pressure switch located on the dryer/evaporator under the hood. You can unplug this switch and jumper it to see if the compressor kicks on or not to narrow down the problem. Also, if the bottle of R134-a is large enough (we use 30lb bottles) and has enough gas in it then it should have enough pressure to push the gas in without the compressor having to be on so I dont know what they mean by "its not taking a charge" unless they are using those little cans.
+1 on the low pressure switch..
Mar 10, 2010 | 05:03 PM
#7
In my experience if the compressor is not locked up it is usually the low pressure switch located on the dryer/evaporator under the hood. You can unplug this switch and jumper it to see if the compressor kicks on or not to narrow down the problem. Also, if the bottle of R134-a is large enough (we use 30lb bottles) and has enough gas in it then it should have enough pressure to push the gas in without the compressor having to be on so I dont know what they mean by "its not taking a charge" unless they are using those little cans.
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Mar 10, 2010 | 06:01 PM
#8
Thread Starter
Joined: Sep 2007
Posts: 5,883
Likes: 2
From: Crowley, TX
turn your ac on and check if the clutch is energizing with a volt meter should have 12 volts if you got voltage on the compressor and compressor is not pumping then its a failed compressor or clutch.. need to replace
if you dont have 12 volts at the compressor then it could be (1) fuses
(2)low charge very common problem, refrigerant is low the system is equipped with a low pressure switch witch means if the system is low on refrigerant it will kill 12 volts to the compressor to protect it,sometimes you have to jump out the switch to charge the system(3)could be a bad switch the one that turns on the ac
if you dont have 12 volts at the compressor then it could be (1) fuses
(2)low charge very common problem, refrigerant is low the system is equipped with a low pressure switch witch means if the system is low on refrigerant it will kill 12 volts to the compressor to protect it,sometimes you have to jump out the switch to charge the system(3)could be a bad switch the one that turns on the ac
In my experience if the compressor is not locked up it is usually the low pressure switch located on the dryer/evaporator under the hood. You can unplug this switch and jumper it to see if the compressor kicks on or not to narrow down the problem. Also, if the bottle of R134-a is large enough (we use 30lb bottles) and has enough gas in it then it should have enough pressure to push the gas in without the compressor having to be on so I dont know what they mean by "its not taking a charge" unless they are using those little cans.
Thanks for the answers guys, I can't stand electrical problems... And FYI I tried turning the compressor on with my EFI LIVE, and it still didn't come on.
Last edited by dlt76028; Mar 10, 2010 at 06:08 PM.
Mar 10, 2010 | 06:06 PM
#9
Pull out the plug on the pressure switch that goes into the dryer bottle on the firewall. Use a paper clip to jump the two pins in the connector and see if that causes the compressor clutch to engage. If it does, you either have a bad switch or are low on coolant. The system might not be taking in coolant because it of a bad/clogged valve or a clogged a/c filter. You need to find someone with a set of manifold gauges (who knows how to use them) and do some trouble shooting.
