Question about Cars & Trucks
May be a plugged drier causing too much pressure on the high side.
what is /was the low side pressure? If in vacuum, that would be a confirmation of the cause.
Posted on May 12, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
If compressor isn't kicking in, check the connector atop the a/c accumulator, beside the coolant recover tank, in the engine compartment. That connector is atop a black bottle, and the connector goes to the low pressure switch. These switches do fail, and you can jump a wire across the connector terminals to see if the compressor comes on (engine running). As this circuit provides part of the ground path from the compressor clutch, if the switch is open, the compressor will never turn on. If the switch is failed, it can be replaced without opening the a/c system. Just disconnect the connector, unscrew the switch, replace it, and reconnect the connector.
Posted on Aug 08, 2008
Several- The system should hold freon for years without leaking. There are pressure switches and they cut off the compressor with an undercharge and an overcharge. You need guages to measure the charge. There are testers the A/C shops have called "sniffers" which can detect a leak. If you have no leak then you need a technician to add or remove freon to get the concentration right. Or you need guages.
Posted on Jun 12, 2009
If by red lined you mean it went over the 250 psi range??
Assumiing that the answer is yes. This is what I think.
The Hi and Low pressure switches prevent damage to the compressor if the pressure is out of range.
Before going any further, check A/C Relay and fuse.
With the engine off, check pressure on both, Hi and Low. Both gauges must have same reading. It should be between 175-200 psi at about 80 degrees temp., if pressure is over that range, the Hi Pressure switch is preventing the compressor clutch to engage, gas needs to be removed by a qualifying A/C Technician.
If Pressre is between range, and both gauges read the same, start engine and turn compressor on, check gauges, The Low side should read about 38 psi and the Hi side should be between 250/275.psi.
Any more trouble shooting should be performed by a Qualified Tech.
Don't forget to rate this post!! Good Luck!!
Posted on Jul 20, 2010
Tips for a great answer:
Jul 24, 2014 | Cars & Trucks
Jul 02, 2012 | 2002 Dodge Durango
Feb 03, 2012 | Ford Ranger Cars & Trucks
Apr 14, 2010 | 1994 Honda Civic
Jul 08, 2009 | 2002 Nissan Sentra
May 11, 2009 | 1998 Dodge Dakota
Apr 29, 2009 | 2003 Toyota ECHO
Mar 05, 2009 | 2002 Chevrolet Venture Passanger
38 people viewed this question
Usually answered in minutes!