Do not appear to be getting power to the clutch coil, relay seems ok. Any ideals?

 

Does the condenser fan run when you turn on the A/C?

 

Yes. After observing more carefully I've discovered power is going to coil when jumping the relay as the clutch moves in but still able to turn the clutch by hand even though the relay is jumped! So decided to replace the compressor w clutch. Pressure is 90 low side 135 high side w engine off. Been told that indicates a bad pressure valve in compressor.

Can you assist with a different issue on same vehicle?

 

Static Low side 90 high side 135, engine off. Start engine, hit ac button, clutch not engaging. Jumped clutch relay, see clutch move in but can turn the clutch by hand while jumped so not engaging. Removed compressor and dryer and reinstalled new.

Poured 4.5 pag oil into suction side compressor while turning it 12 times. Replace compressor and drier, vacumn 1 hr reached -30 and held. Jump relay, start engine hit ac button, can barely get 1/2 can of 12oz r123a. See freon bubbling in drier sight glass. 90 low side like 65 high side. Gave up until can get some direction of what's happening. Is there an obstruction or something. Puzzled!

 

When the compressor fails, you minimally must replace the compressor, condenser, and expansion valve. You probably should also replace the evaporator.

In addition to buying these^ new parts, you must also thoroughly flush the A/C system lines before you install the new parts because the failing compressor vomits small metal particles throughout the A/C system.

 

This is getting crazy. Seem to have two problems. AC clutch will not engage without jumping relay, and system does not seem to want to accept freon, less than a can.

Have replaced:
Compressor (poured 4.5oz pag 46 into & turned 12 times by hand)
Dryer & pressure switch (has 4.67v at plug)
AC clutch relay
Expansion valve
Evaperator temperature sensor
Condenser (poured 1oz pag 46 into)

Flushed all lines and evaperator and blew out. Poured 1oz pag 46 into big line.

Have attempted to charge this new compressor 3 times by jumping relay. Pre charging high side with liquid always stops at 90 or so psi on guage. Start engine, open low side ****, low side always jumps to match high side and both climb to around 135 and hold.
Always takes less than 12oz freon

Help, have had multiple mechanics advise and the next thing to try is replace the blower motor resistor (blower motor functions perfectly but he's seen them interfer with the ground request from ecu to clutch relay).

Any ideals?

 

Ok, I guess I have to assume the new compressor is defective since the pressures with relay jumped equal each other and the liquid freon in the sight glass just sits and does not flow. And since I replaced everything else and flushed and blew out the lines. I can warranty out the compressor and change it out.
But the clutch not engaging is baffling. I've read and watched videos of the blower motor resistor blocking the ground from ecu to clutch coil but they all describe the blower motor showing symptoms and mine does not. It functions correctly on every speed?

Help! Anyone!

 

Why are you charging the high side? Just do liquid through the low side? Think I’ve heard high side charging can damage the compressor.

Also: I haven’t checked wiring diagrams but if the pressure switch isn’t seeing enough pressure in the line it might not let the compressor clutch engage.

 

Good catch!

 

 

I'm no mechanic with formal training, but I've read articles and seen videos of precharging liquid on the high side with engine off. I have never heard of charging with liquid on low side. But maybe it did damage the new compressor precharging it on the high side, Idk if it did, or was just faulty from the factory. Hey, I'm teachable and eager to learn! How do you charge a new system?

Also, I've traced down all the circuits on the ac and have determined the ac clutch problem is from the ecu. Strangest thing I've ever seen but believe it was shorted out from oil dripping down the wiring harnest into the 32p connector into the ecu! How the hell did that happened? Now how do I clean up the connector before plugging into the ecu I replace with so it does not happen again?