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#1
11-08-2006, 01:10 PM
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Caravan AC hisses when compressor disengages
97 Grand Caravan with front and rear AC - recently there's 5-10 seconds of hissing from the front and rear evaporators when the AC compressor disengages. Seems to work fine otherwise. What does this mean?
Thanks, Sixto 93 300SD 
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#2
11-08-2006, 01:22 PM
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the switch is going out... they're all like that, i think...
no ideas on how to prevent it, other then with limited use. no ideas on replacement either ~Nate
__________________
95 Honda Shadow ACE 1100. 1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle! 2012 Escape, 'hunter" (5 sp 4cyl)
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#3
11-08-2006, 01:24 PM
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Equalization ...quite normal...although manufacturers try to reduce the problem...the orifice/expansion valve has a small hole and the hi side and lo side are balancing out.
.
__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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#4
11-08-2006, 01:54 PM
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Thanks for the replies.
Switch = could be the vaccum actuators but why would there be a corresponding sound from the rear evaporator area? Expansion valves = you're saying it's not pending failure? It would be too much of a coincidence that both expansion valves degrade at the same time. Sixto 93 300SD
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#5
11-08-2006, 02:22 PM
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My 1996 was doing the same thing prior to my servicing it. I went through the troubles detailed in this thread:
http://www.peachparts.com/shopforum/showthread.php?t=159315 After replacing the expansion valves and the properly charging the refrigerant the problem was gone. I suspect you are getting low on refrigerant or your expansion valve is not closing tightly enough.
__________________
http://i284.photobucket.com/albums/l...aman/Fleet.jpg Peach Parts W124.128 User Group. 80 280SL 85 300SD 87 300TD 92 300D 2.5 Turbo 92 300TE 4Matic
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#6
11-08-2006, 02:51 PM
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The TXV hiss is "normal" however oftentimes a low charge condition will cause it to be more pronounced. You might want to check your charge.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#7
11-09-2006, 11:27 PM
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My mom has a '99(I think) Town & Country, which is essentially the same vehicle, and hers started to hiss and a few weeks later she complained of it not getting cold enough. I put my gauges on it and I think I remember adding at least 2 twelve ounce cans in there and all was good with no more hissing. I'd check the charge.
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo
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