no power to compressor
02-24-2009, 05:39 PM
#1
no power to compressor There is no power going through the electrical connector to my ac compressor. it has ground but no power. we checked the relay and fuses that were under the hood and all were good. anyone know what the problem could be? the motor has been in and out twice BTW.
02-24-2009, 10:06 PM
#2
TECH Fanatic
Join Date: Jul 2007
Posts: 1,516
Likes: 0
Received 0 Likes
on
0 Posts
There are low and high pressure switches on the system that will allow the compressor to kick on.
What are the pressures on the system with it off? If there is pressure in the lines you can try jumping across the low pressure switch connector. If the compressor kicks on and the system runs fine, then the low pressure switch is bad.
What are the pressures on the system with it off? If there is pressure in the lines you can try jumping across the low pressure switch connector. If the compressor kicks on and the system runs fine, then the low pressure switch is bad.
02-25-2009, 06:21 AM
#4
you can have pressure without the compressor coming on, my compressor kicked the bucket and i still had plenty of pressure in my system. My guess is you just need a new compressor, sucks because they are about 200-300 bucks
02-25-2009, 12:58 PM
#5
NO ITS NOT THE COMPRESSOR!!!!! there is no power coming to the compressor to turn it on! I am asking if there is maybe a common problem for their not being any power to it, or what to look for when searching for the problem.
its a wiring or electrical issue, not the compressor.
its a wiring or electrical issue, not the compressor.
Last edited by WhiteBird00; 02-25-2009 at 01:56 PM. Reason: merge consecutive posts
02-25-2009, 01:13 PM
#6
TECH Senior Member
Scan the car and see if it has P0530 stored. www.gearchatter.com/viewtopic8840.php Note it says this code will not illuminate the MIL.
Trending Topics
02-25-2009, 08:32 PM
#10
TECH Fanatic
Join Date: Jul 2007
Posts: 1,516
Likes: 0
Received 0 Likes
on
0 Posts
Thats probably a vehicle specific code, so I dont know if the autozone scanner will read it.
Did you try tracing backwards in the circuit? Whats the next thing in line before the compressor? Check both sides of it to see if there is power coming to it, but not out. If it doesn't have power coming to it, then move to the next thing before that.
Did you try tracing backwards in the circuit? Whats the next thing in line before the compressor? Check both sides of it to see if there is power coming to it, but not out. If it doesn't have power coming to it, then move to the next thing before that.
02-26-2009, 09:36 AM
#12
Have you checked the HVAC fuse in the dash fuse panel? The compressor relay is controlled by the PCM which responds to the AC request from the dash controls which are powered by the HVAC fuse in the dash. Without it, the compressor relay will never activate to send power to the compressor.
02-26-2009, 12:27 PM
#13
Have you checked the HVAC fuse in the dash fuse panel? The compressor relay is controlled by the PCM which responds to the AC request from the dash controls which are powered by the HVAC fuse in the dash. Without it, the compressor relay will never activate to send power to the compressor.
02-27-2009, 06:21 PM
#14
11 Second Club
iTrader: (13)
Join Date: Dec 2008
Location: Cape Coral, Florida
Posts: 365
Likes: 0
Received 0 Likes
on
0 Posts
Stop what you are doing and find someone with a set of a/c gauges. You say there is no power to the compressor, right? That is most likely because the criteria needed for the pcm to switch it on are not being met. In a/c diagnosis, the next step now is to make sure you have proper refridgerent pressure. If you have no freon in there, the pressure switches will not signal the pcm to turn on the compressor. This is because if you continue to run a compressor without freon (which also carries the oil that lubes your compressor) you will seize your compressor. You said the engine has been out twice?? There is a good chance an a/c line was removed in the process. Maybe it has not been recharged, or there is a leak which has caused the system to go too low to trigger the pressure switch.
