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AC is dead. where to start?

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Old 07-07-2014, 09:15 PM   #1
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AC is dead. where to start?

the ac on my 96 3rz dosent work. I rebuilt the engine but I bought the truck with the engine in the truck bed so I dont know if it worked before. I charged the system and the pressure shot up to the max with a 1/4 of a small can. I think the pressure is not passing through the pump. Notable idle increase when switch is pressed, switch lights up, everything is connected. I did run the pump dry for a few weeks. AC systems are new to me and any help is greatly appreciated.
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Old 07-07-2014, 09:45 PM   #2
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Does the compressor turn or is it seized?
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Old 07-07-2014, 10:02 PM   #3
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Check to see if the compressor actually engages, u can tell by looking at the front of the pulley and have someone turn on the AC. you'll know when it comes on, if nothing happens u could have a bad compressor clutch, which I doubt because u said ur idle increases when u switch it on.

Then u can feel the AC lines for temp. The discharge line coming out of the compressor should be HOT. be careful when touching it, it's the one that leads to the top of the condenser (the thing that looks like a radiator in front of ur actual radiator). Then check the other line that goes back into the compressor, it should be very cold. Then report back. But if I were you I'd have the system professionally charged. There is a spec that says exactly how much refrigerant should be in the system as well as oil that keeps the compressor lubricated. Also, if you have manifold gauges u can hook them up and look at ur pressures. The low side (cold) should be from 22-48 psi if you have an FOT system. 10-30 psi for a TXV system. while the high side(hot) should vary depending on ambient temp.
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Old 07-07-2014, 10:46 PM   #4
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If you just assembled the system out of the bed and shot a can of auto parts store "freon" onto it then chances are the AC system is ruined.
You might get lucky and an AC shop may be able to purge and dry the system, but the moisture in the air in the system will quickly destroy the compressor, and there is not enough oil (or "freon") in 1/4 of a can to properly charge the system.

You have to get the air out.
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Old 07-08-2014, 06:18 AM   #5
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Best to take to a pro at this point. Like Styx and Rich said, it requires lubricating oil made for that as well as 134. Hey Styx, do you wrench for a living? Seems like you have a lot of knowledge!lol
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Old 07-08-2014, 11:31 AM   #6
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Quote:
Originally Posted by Andy.G View Post
Best to take to a pro at this point. Like Styx and Rich said, it requires lubricating oil made for that as well as 134. Hey Styx, do you wrench for a living? Seems like you have a lot of knowledge!lol
Thanks! I take that as a compliment... I work at a tire shop for now but I'm almost done with the automotive program at UTI. And I've been working on cars/trucks/bikes pretty much all my life
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Old 07-08-2014, 12:45 PM   #7
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Another thing to check is the dehydrator. There is a view port at the top and when the A/C is running properly, you'll see bubbles flowing. If you don't see bubbles, the system is either not charged or the compressor is not flowing.

Its located on the driver side in between the radiator and headlight housing.
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Old 07-08-2014, 03:32 PM   #8
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Quote:
Originally Posted by Styx586 View Post
Thanks! I take that as a compliment... I work at a tire shop for now but I'm almost done with the automotive program at UTI. And I've been working on cars/trucks/bikes pretty much all my life
It is a compliment Styx! Impressive knowledge and drive to learn more. Good qualities in this world.
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