85 is way high for the low side sounds like too much R-134a 45 to 50 at the most

 

Yeah, may be high pressure switch locking it out then.

 

if i unhook comp. and hook 12 v to one side of coil and the other to gr it should make clutch kick in all it is doing is giving 12v out the other wire so does that mean coil is bad its not hooked to any switches just to batt. for check

 

The hi and low combo sensor I have no experience with.

Dump some R-134a see if it kicks in did you just add some R-134a 85 is very high?

 

How are you measuring this?

Do you have 12 volts connected to one side of the clutch and the other side connected to ground? Where are you connecting your test leads?

If your test lead is on a clean ground and you have 12 volts on both sides of the clutch, then the ground for the clutch is bad.

If you are measuring across the clutch, it should read 12 volts. Put an ammeter in line, the clutch should draw 2.0 - 3.9 amps. If you ohm out the coil it should be 3-6 ohms.

 

yes I unplugged coil and ran a 12v wire to blk wht wire from batt,and blk coming out of comp had 12 v.couldn't put it on gr side of batt because it was shorting every time i touched it.Before i installed it i could run a hot to one wire and ground other and magnet worked.then i installed it and now it don't work.The one that i took out in the first place shorted the same.It is like something is shorting the coil out.The one i put in was junkyard.I ordered a new one going to see if that works but i will put a fuse inline.Also I ohm metered it got no resistance, should have been between 2 and 5 from what i read,but mag still worked before i installed it tks for reply

 

All this is meaningless if you have too much R-134a or the compressor is dead.

I think you have another problem

Did you just pump more R-134a in the system before this happened?

 

The problem with the high/low side pressures is that the compressor isn't running.

If you're hooking a wire from the battery to one side of the clutch and from the other side going to a clean ground the coil should engage - there will be a spark.

What is shorting out?

Measure the resistance of the coil as I indicated earlier. Also, with both wires disconnect from the coil measure resistance to ground - checks for a coil shorted to ground.

 

He doesn't seam to want to answer if he just pumped any R-134a in to me that's a good indication of what's going on.


He was forcing it to work and I think he messed up his compressor. Usually if it wont turn on something is very wrong and forcing it to work is not good and can/will destroy the compressor.

 

I just got back,I ordered a new coil I checked coil unplugged with a continuity and ther was none,I checked with ohm meter one lead to one pin one to the other no ohms ,ac was like it is i just bought truck,I need to ghet a cannister to bleed off 134.Im sorry i can't get back to u when u post but im taking care of a lot of thingsand can only work on truck between jobs