Variable displacement compressor (clutch-less)

DASMITH1983

MEMBER
2007 JEEP PATRIOT
2.4L
4 CYL
4WD
AUTOMATIC
150,000 MILES

I recently replace my compressor, drier, and orifice, on the vehicle listed above with a clutch-less compressor. Is there a different procedure for recharging the system? After evacuation, only a very small amount gets added before it stops charging, not even a 1/4 amount of what is needed to fill the system. Total capacity is (1.125 lbs) Also at this point the low side pressure reads high.

7 Replies

KASEKENNY

MECHANIC
18,907 POSTS

I imagine the PCM is shutting it off because it is not seeing the proper pressure or "response" from the compressor.

Can you send a link for the compressor that you put on this vehicle so that I can review how it works?

From what I remember Jeep did not use variable displacement compressors until around 2010 so we may have an issue there.

Basically the PCM is sending and on off signal and this compressor may not operate with that. There are two common VDC types, internally and externally controlled so let me know what this compressor is and we can start figuring this out.

Also, can you hook up a gauge set and tell me what the low and high side pressure is? Thanks

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

SPONSORED LINKS

Was this

answer

helpful?

Yes

Wednesday, July 1st, 2020 AT 3:19 PM

DASMITH1983

MEMBER
5 POSTS

Here are the pics of the original compressor with solenoid removed, and the new one installed. I currently have the system open, waiting on a new condenser that'll be here tomorrow. I should be able then to hook up those gauges. here is the link: https://www.rycompressors.com/shop/2007-jeep-patriot-kt-ea58-39512.html
other searches come up with same type of compressor. I can hear the solenoid click when applying 12v to it from a power supply.

Images (Click to make bigger)

Was this

answer

helpful?

Yes

Wednesday, July 1st, 2020 AT 3:49 PM

DASMITH1983

MEMBER
5 POSTS

One other thing, after replacing the compressor, I found a couple bad grounding locations, one of which supplied ground to the compressor solenoid. That may have been my original problem to begin with, but too late now.

Was this

answer

helpful?

Yes

Wednesday, July 1st, 2020 AT 4:15 PM

DASMITH1983

MEMBER
5 POSTS

Fyi, even with the new compressor, system wouldn't take any refrigerant until that ground was fixed.

Was this

answer

helpful?

Yes

Wednesday, July 1st, 2020 AT 4:18 PM

KASEKENNY

MECHANIC
18,907 POSTS

Okay. Just to make sure when you are charging the system we are evacuating it and pulling it into a vacuum before trying to put Freon in it. If you are, let's just try it again and see what happens this time. Then we can get the pressures with as much Freon you can get into it. Thanks

Here is a guide in case you need that:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

SPONSORED LINKS

Was this

answer

helpful?

Yes

Wednesday, July 1st, 2020 AT 7:53 PM

DASMITH1983

MEMBER
5 POSTS

First picture shows vacuum I pulled for 45 minutes. Second picture shows where pressure evened out after.3 lbs of r134.

Images (Click to make bigger)

Was this

answer

helpful?

Yes

Thursday, July 2nd, 2020 AT 5:53 PM

KASEKENNY

MECHANIC
18,907 POSTS

Is the second picture with the compressor on or just with a static system? I assume the compressor is still not running? If so, open the ports so that it will pull more Freon in and then jump the compressor so that it runs. You may just be getting shut down due to the low pressure switch.

You do this by just running a jumper from the battery to the light blue wire on the compressor. Once you run it for 15 seconds, you should be able to remove the jumper and the compressor will run if this is the issue.

Image (Click to make bigger)