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Jumping Compressor

jjsustar on Sat August 16, 2008 12:36 PM User is offline

Year: 2001
Make: Dodge
Model: Grand Caravan
Engine Size: 3.3
Refrigerant Type: 134a
Country of Origin: United States

I'm trying to jump the compressor in my 2001 Grand Caravan. The low pressure switch has 3 wires. pink/yellow, blue/green, blue/black.
Which one do I jump?

GM Tech on Sat August 16, 2008 3:19 PM User is offline

Any 3-wire "switch" is NOT a switch- it is a pressure transducer- does low pressure disable, high pressure disable, fan enable-- if you try to jump it you chance ecm damage-- so don't try it-- evacuate and charge into the vacuum- when pressure hits the low limit- the transducer will tell the ecm and engage the compressor for you.....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jjsustar on Sat August 16, 2008 4:57 PM User is offline

the compresser is not cycling on. So, you're saying I can release the 134a into the system and it will bring the system up to pressure without the compressor running.
Everything i've read says to jump the compressor so it will suck the 134a into it.
I know there's a leak in the condenser. I'm just trying to buy some time until I can fix it. I was going to use that 134 with leak stop in it.

Edited: Sat August 16, 2008 at 5:04 PM by jjsustar

GM Tech on Sat August 16, 2008 6:17 PM User is offline

I would only ever use stop leak as a last ditch effort- or if I knew there would never be a chance of repairing it properly- otherwise you will clog up any reclaim machine, I have never seen it work- snake oil if you ask me.

Most Caravans I see are evap leakers....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Sat August 16, 2008 at 6:18 PM by GM Tech

jjsustar on Sat August 16, 2008 9:33 PM User is offline

thanks. I'll just wait until I can fix it right.

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