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2005 dodge magnum loosing charge

wrench on Fri January 30, 2009 12:14 PM User is offline

Year: 2005
Make: dodge
Model: magnum
Engine Size: 5.7
Refrigerant Type: 134A
Ambient Temp: 75
Pressure Low: na
Pressure High: na
Country of Origin: United States

Loose it charge in 30 days, down to 15 PSI sniffer & dye don't show any leak, took facia off to get good access to dryer,cond,connection on cond. sniff around compressor, none. fish a small rag in the evap drain with a wire, no trace of dye, sniff the center outlet= negative. Do I have to tell the owner to trade his car or will I have to starve on food? Any one got tip, input?
Thanks wrench

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diesel is music, music is noise!

TRB on Fri January 30, 2009 2:07 PM User is offlineView users profile

Try putting a shower cap over the clutch assembly. Let it sit for a while and then insert your probe inside the clutch/cap. Leaks can be trouble at times but they will show up eventually.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

wrench on Fri January 30, 2009 3:36 PM User is offline

Thanks TRB,
I am on trace of some, I put some gas in & start the AC, pressure went way to 600 & the blow valve open a few time= expension valve to replace & it on it way to me now. (dealer could not find why it was not performing as it should) will see if I can find something else.
wrench

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diesel is music, music is noise!

mk378 on Fri January 30, 2009 3:53 PM User is offline

Does the condenser fan work? That could explain what happened: the driver turned on the A/C, overpressure because of no condenser fan, and lost most of the charge through the relief valve. Also relief valves don't always re-close fully after they pop.

A blocked expansion valve will not cause extreme overpressure unless someone also keeps charging (to the point of overcharge) more refrigerant trying to get the low side up. Which you may have done.

That car probably has a sensor on the high side which controls the condenser fan and also when to shut down the compressor due to overpressure. Both of those functions are through the engine computer reading the sensor.

Edited: Fri January 30, 2009 at 3:58 PM by mk378

wrench on Fri January 30, 2009 5:57 PM User is offline

Yep the fan turn. When I got it it was empty at 15 PSI, I load to 70 PSI static to check for leak, ambient was 75F, fire it up high side went to 600 & pop valve open & down to 350 & back & forth, low side stay at 70 PSI.
The lower bolt holding the TX valve was corrode so had to work it get it out. Would like to replace that anchor plate. When I pull the return tube from the TX valve, the dye put in by the dealer came out, it was stuck there, it did not circulate. Hoping to close that one tomorrow.
input? thanks wrench

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diesel is music, music is noise!

TRB on Fri January 30, 2009 6:14 PM User is offlineView users profile

You need to check the system for a restriction if you have 70psi and then 600psi as soon as the system is started.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Fri January 30, 2009 at 6:15 PM by TRB

wrench on Fri January 30, 2009 9:33 PM User is offline

blow air trough evap & the 2 tube between the service ports & evap & it open.
wrench

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diesel is music, music is noise!

TRB on Fri January 30, 2009 10:19 PM User is offlineView users profile

70psi to 600psi is poor air flow as mentioned, extremely over charged system or a restriction. Need to remember there are many passes in evap and condenser cores. Blowing air provides only a sign that some passages are clear! Has sealer been added to this system to help with the leaks?

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

wrench on Fri January 30, 2009 10:48 PM User is offline

I ask about the sealer, & the owner say no, & the work order from the dealer show only "testing for leak & adding dye ($76.00))" & there was nothing in the tube showing contamination beside the dye which look like it did not circulate. As the owner remember, it had a smog like in the defrost outlet, he turn it off & back on after a while & then after that the performance start to deteriorate.
Did the TX valve fail in close position, the evap freeze, The restriction has to be between the high side port & low side port ( H is locate before the TX valve, & L after the valve)???
wrench

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diesel is music, music is noise!

wrench on Sat January 31, 2009 4:24 PM User is offline

Thanksssssssssssssss every one,
fixed,, Had to pull out the hold down clam & helicoil the treads & new bolts. Kind of toutchy to line up the tube when you don't see= no small mirror, the borescope is straitgh, anyway it's done.
thanks again wrench

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diesel is music, music is noise!

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