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Unread 07-13-2010, 12:44 AM   #1
msn636
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2003 WJ 
 
Join Date: May 2009
Location: Arlington
Posts: 7
wj 4.0 a/c problems

So it holds pressure but it just wont blow cold. It hisses when i accellerate and gets even warmer. Compressor seems to be working but the electric fan doesnt ever kick on. Could that be part of it? If so how come it wont? I straight wired it and the fan works. Relay is good and i replaced the temp sensor. Im stumped and its too dang hot in Texas.

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Unread 07-13-2010, 12:13 PM   #2
rgulley
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Are you saying the Ac blower motor in the dash is the one you straight wired?
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Unread 07-13-2010, 04:48 PM   #3
msn636
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No, sorry. Its the electric fan behind the radiator. I didnt know if it could be related to my a/c problems. Either way, i check the pressure and it reads between 40 and 50. Still blows warm.
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Unread 07-13-2010, 09:39 PM   #4
rgulley
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The fan behind the radiator will cycle on and off at times and really doesnt have any direct relation to the ac. 40/50 sounds good, is the compressor running? Is the gage jumping?
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Unread 07-13-2010, 10:10 PM   #5
SplitNail
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That fan needs to be on when the AC is on to remove the heat from the AC. The air blows over the condensor to remove the heater from the air. If the fan isnt coming on then the pressure if building in the lines and the pressure cycle switch is tell the compressor to turn off, in return its blowing hot air.
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1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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Unread 07-13-2010, 10:27 PM   #6
rgulley
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Here Is a diagram that better explains how it works.
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Unread 07-13-2010, 11:09 PM   #7
msn636
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The gage isnt jumping. But the fan never comes on. Ive had it idleing for 15 minutes and nothing. But the coolant temp is good. And the compressor comes on. So why isnt my elec fan coming on at all?
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