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I've got either a belt or a compressor problem - UPDATE!!!


 
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Tue Jul 12, 2005 5:27 pm    Post subject: I've got either a belt or a compressor problem - UPDATE!!! Reply with quote

When I start up the heep now and turn on the AC, the engine rattles twice up near the front, then kicks in with no more rattles or vibes. I'm assuming the AC compressor is probably going. I had practically no AC earlier last month and picked up two cans of the new refridgerant with the oil AND refridgerant together, and was able to charge it back up again (and no, I didn't overcharge it, according to the gauge). I probably need to take it to an AC specialist to see if they can diagnose it, but I'm sure it's not gonna be cheap. Any other ideas?
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Last edited by Drake69 on Fri Jul 22, 2005 3:51 pm; edited 1 time in total
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ThePhantum
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Joined: 23 Jan 2004
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PostPosted: Sun Jul 17, 2005 8:22 pm    Post subject: Reply with quote

According to "the gauge"? When charging an A/C system, you shouldn't just shoot refrigerant in. You need a gauge set, consisting of a high side gauge and a low side gauge. You need to check the high side and low side pressures vs. the ambient air temperature as well as the temperature at the vents...all of course with the A/C running.

The rated pressures at given air temperatures are fairly specific. As an example at an air temp of 70* the vents should blow air between 27*-38* with a high side pressure of 180-240psi. But at 90* with the vents should blow 37*-48* with a high side pressure of 250-300psi. So a 20* ambient air temperature variance raises the temperature of cooled air 10* and raises the pressure variance of the system by over 100psi. There's no way a gauge with a yellow, green and red zone can help you dial that in.

Did the problem start after you charged it?
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Mon Jul 18, 2005 2:32 am    Post subject: Reply with quote

ThePhantum wrote:
Did the problem start after you charged it?


Yup, it did. And the gauge is one of those wonderful ones that "guesstimates" the amount on pressure in the system, so it's definitely not accurate. On some days, the compressor is quiet, but on most days it sounds like it's trying to come out of the engine cavity. I know to run the compressor low at first, even before cranking the engine. I'll have to get the A/C system checked out after Paragon, although if it does fail up there it won't be fun (100deg. + in the cab... Shocked ).
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StreetDoc
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Joined: 22 Dec 2004
Location: Unionville, VA

PostPosted: Mon Jul 18, 2005 12:21 pm    Post subject: Reply with quote

If you take the top off it will be much cooler. I'll bring a BIG saw just in case. Finger
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Mon Jul 18, 2005 3:34 pm    Post subject: Reply with quote

Go topless, BABY!!! rofl
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Fri Jul 22, 2005 3:50 pm    Post subject: Reply with quote

Well, I had a mechanic listen to it at idle with the AC running, and he says the squealing sound is coming from the direction of the water pump. He told me to turn the Jeep off for a few hours, loosen the serpentine belt, and grab the wheel in front of the pump. If there is any play in the wheel I'll have to replace the entire water pump. Does that sound right?
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Farmer Dean
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Joined: 19 Feb 2005
Location: Paso Robles, California

PostPosted: Sat Jul 23, 2005 9:24 am    Post subject: Reply with quote

Drake, can't say that the squeal is from the pump, but it could be. I do agree that if you have any play in the pump or weeping, I'd change it out. They're not that expensive and a couple of hours with basic tools will change it out. FD.
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