Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
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
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