Where exactly is the high pressure switch located...my A/C is blowing warm air...I jumped the low pressure switch on the accumulator and the compressor cuts out at 40...on the gauges...

SOURCE: 1996 lincoln towncar. No a/c compressor engagement unless jumped

the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.

Ronny Bennett Sr.

• 6988 Answers
• Posted on May 17, 2010

SOURCE: 94 civic 1.5 air condition won't blow cold,

Are you using gauges?What are the pressures?And are the cooling fans coming on when ac is on?

Testimonial: "Changed compressor and cool as can be in Arizona"

SOURCE: 2004 Honda CRV air conditioning stopped blowing

Hi!

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!!

SOURCE: I have a 2003 Nissan

105 psi? If so that is way to hi...especially for a mid-sized car. You ideally want you pressure to be between 40-50 psi. If you pressure is that hi you might have blown the pressure valve on you compressor, which is not a part that is sold seperately. You should take your car to your local Pep Boys and have them run a A/C diagnostic which runs around $45 to give you an better idea. If you don't know what you're doinf the A/C system is not something you want to play a guessing game with. Especially since it's illegal to work on it without the proper tools and licenses.

SOURCE: AC will blow cold air for a few minutes then start

you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
Good luck

Testimonial: "Thank you Magoly, its working Thank you very much."