2008 Dodge Caravan refridgerant leak

Tiny
GASNOMIS
  • 2008 DODGE CARAVAN

Air Conditioning problem
2008 Dodge Caravan 6 cyl Front Wheel Drive Automatic 88,000 miles

R134 leaking from somewhere that I cannot locate. I have had the dash partially dissembled with no luck finding the leak. It will sometimes hold pressure for a day or two, and cool normally (approx 25 degree drop from ambient). Low side pressure w/compressor running in the blue area on Inter Dynamics can-top gauge. Then there will be the sound of gas venting from under the dash (evaporator, I guess) and low pressure cut-off engages until coolant is added. When this occurs, no obvious odour, 'smoke', or sign of leak detector dye anywhere. I don't know if this is normal expansion valve/orifice sound from refrigerant changing state. No luck with various leak sealers. I have been careful not to overcharge, and the electric cooling fan is running normally. Engine temp is in center of normal range.
Is there a high pressure relief valve that may be activating, perhaps at too low a pressure?
I cannot find a manual for the 2008 year yet, at least not one I'm willing to pay high dollar for!

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Monday, April 19th, 2010 AT 7:37 PM

1 Reply

Tiny
BMRFIXIT
  • EXPERT
  • 19,526 POSTS

AC leaks very hard to locate and have to use dye and black light to check for it or a special gas detecting tool
No smell and not visible to be detected by naked eye
Check for a wet spots on the lines and system component
Smoke test also the system can help in locating the leak

check the area by the firewall
Good luck

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Friday, April 23rd, 2010 AT 7:02 AM

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