A/C issue after engine rebuild

fastolds

New member
My 3rz engine was out for something like 8 weeks while it was getting rebuilt. When I got everything back together, it seems my A/C isn't getting as cold as it used to.

I put a thermometer in the vent, and it usually hung around 50*F. after extended driving, it would work down to 40*F. It used to be ice cold all the time.

Checked the pressures. The high side pressures would climb until the compressor would kick off due to going too high. Low side was a little lower than I would have liked to see, something around 20 psi, until the high pressure would kick it off.

Checked the charge. the system, according to the sticker was 1.32-1.54lbs. on recovery, I got 1.37lbs.

My fan clutch doesn't seem to engage. With a heavy work glove, I can stop the fan with my hand at idle.

The A/C seems to be working to some degree, since I see a ton of water coming out of the evap drain. The temps and humidity were up, but the pressures and vent output still seem a little low.

I think the clutch is OEM, since I have owned it since it had 64K miles on it, and it now has 217K. I like writing out my problem in a forum, not only for the help, but also to help me put all of the problems out on a screen for me to sort out.

On a side note, the little 2.7 seems to be working almost perfectly, except for the A/C. I did have to replace the harmonic balancer, due to a wobbly outer ring.

Any thoughts on this to help me out?
Thank you!
 
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I'm no AC jock, but I know a bad fan clutch can send pressure soaring. My FC died at 120k, yours doesn't owe you a thing. Get an Aisin OEM from RockAuto or PartsGeek for less than $100 and see what happens then.
 
The fan cools the warm refrigerant going thru the condenser. If the AC works better when you're driving you definitely need a new fan.
 
Unless your engine temp is high enough to cause the fan clutch to tighten up, being able to physically stop the fan blade from turning at idle is completely normal.

Im learning the ins and outs of the AC system myself... What Ive been able to gather is if the high side is showing higher than normal pressure, you have blockage in the system. IIRC, I just read in the FSM that acceptable high side pressure with the engine at 1500 rpm is between 199 and 288 psi.
 

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