AC Compressor quick fix by pass ?
#1
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AC Compressor quick fix by pass ?
I came back to town from deer camp to hopefully address this compressor noise. I need a temp fix so I can get back to camp. It started growling with defroster on, not a belt squeal but a growl like bearing or internals. Not real sure never had an AC go bad on a vehicle. I don't want to get up in mountains and have it seize and burn my belt off. I thought it was alternator up at camp, but is ac compressor for sure.
AC is empty, non working for sometime now. I searched and found ac delete pulley options, tracking down parts could take atleast few days IF I find the right bracket.
In a nutshell, can I make this compressor function as a free wheel so it will not lock up and burn my belt off. I know nothing of the ac clutch, can it be disabled to free wheel like a idler pulley, if so how ??
1990 4.0 aw4 sanden 508 compressor
AC is empty, non working for sometime now. I searched and found ac delete pulley options, tracking down parts could take atleast few days IF I find the right bracket.
In a nutshell, can I make this compressor function as a free wheel so it will not lock up and burn my belt off. I know nothing of the ac clutch, can it be disabled to free wheel like a idler pulley, if so how ??
1990 4.0 aw4 sanden 508 compressor
#2
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Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Is it making noise even with the A/C or defrost off? If not, just unplug the connector that goes to the A/C clutch.
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Year: 2000
Model: Cherokee
Engine: 4.0
If it is growling only with the defroster on, it could just be the clutch. This also indicates that the system is NOT empty - there's a low pressure switch that wouldn't let it cycle on. Trace back the two wires coming off the clutch assembly and there will be a connector, just unplug it and see if your noise goes away.
On this compressor, there is a static shaft that the pulley rides on so there's no "quick" way to do a total bypass other than a delete pulley.
On this compressor, there is a static shaft that the pulley rides on so there's no "quick" way to do a total bypass other than a delete pulley.
#5
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If it is growling only with the defroster on, it could just be the clutch. This also indicates that the system is NOT empty - there's a low pressure switch that wouldn't let it cycle on. Trace back the two wires coming off the clutch assembly and there will be a connector, just unplug it and see if your noise goes away.
On this compressor, there is a static shaft that the pulley rides on so there's no "quick" way to do a total bypass other than a delete pulley.
On this compressor, there is a static shaft that the pulley rides on so there's no "quick" way to do a total bypass other than a delete pulley.
I'll rip it off after hunting season and drain compressor oil to see if any shavings are present, possibly just needs a bearing and clutch. I'll put some gauges on it to see pressures as your right it shouldn't run without r-12 in it. The last time it was charged it worked for awhile then cooling stopped so I figured freon leaked again. I didn't bother putting a gauge on it because I was done wasting money on expensive r-12. If I can rebuild compressor, I got one can left to maybe top it off.
#6
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Local wrecking yard want an arm/leg for parts lately. LKQ bought up most of the u pull its and closed them to entry. So i am not too confident finding a delete setup locally. I priced a 91-93 bracket and delete pulley at around half the price of a new compressor, so far. $65 for a used compressor is no deal either. I will go with new before paying that much for used.
Thanks for the replies.
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Year: 97
Model: Cherokee
Engine: 4.0
Was yours making noise without ac or defroster on ? Did it go pretty quickly after noise first appeared ?
Local wrecking yard want an arm/leg for parts lately. LKQ bought up most of the u pull its and closed them to entry. So i am not too confident finding a delete setup locally. I priced a 91-93 bracket and delete pulley at around half the price of a new compressor, so far. $65 for a used compressor is no deal either. I will go with new before paying that much for used.
Thanks for the replies.
Local wrecking yard want an arm/leg for parts lately. LKQ bought up most of the u pull its and closed them to entry. So i am not too confident finding a delete setup locally. I priced a 91-93 bracket and delete pulley at around half the price of a new compressor, so far. $65 for a used compressor is no deal either. I will go with new before paying that much for used.
Thanks for the replies.
Just a tip for when you put it all back together again. If you also put a new drier on it and clean the system of all the old r12 oil, r134 oil and charge works just fine in a system and compressor originally designed for r12. And they make adapters for your fittings.
A good friend of mine who owns a jaguar shop in hollywood figured this one out back when they first outlawed r12 and were scamming the whole country for outrageously expensive retrofit conversions. I have since done many of these myself with no problems.
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Maybe not for you, but for the thread, not sure what years this works for besides 87-90 >
AC Bypass/Idler pully. (unconfermed) > Get an AC bracket from a 92, go to NAPA to pick up a Dorman AC bypass pulley for a 92 and newer. NAPA # p/n 660-1819. The belt size remains the same. You need to use the pulley spacer that comes with in the hardware bag, it moves the pulley out about an 1/8" so that it lines up perfectly with the rest of the stock pulleys.
AC Bypass/Idler pully. (unconfermed) > Get an AC bracket from a 92, go to NAPA to pick up a Dorman AC bypass pulley for a 92 and newer. NAPA # p/n 660-1819. The belt size remains the same. You need to use the pulley spacer that comes with in the hardware bag, it moves the pulley out about an 1/8" so that it lines up perfectly with the rest of the stock pulleys.
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Year: 1991
Model: Cherokee
Engine: 1999 4.0L
AC clutch should freewheel when not engaged. If its engaged all the time then the clutch is broken and dragging. You can replace just the clutch and bearings, that won't require you to evacuate the system.
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Year: 2000
Model: Cherokee
Engine: 4.0
So I disconnected the clutch wire and the noise is gone for the most part with defroster on. Closer inspection today, Noise is loudest when first revving rpm's up AND when rpm's rev down right before idle. Kinda like grinding to a stop.
I'll rip it off after hunting season and drain compressor oil to see if any shavings are present, possibly just needs a bearing and clutch. I'll put some gauges on it to see pressures as your right it shouldn't run without r-12 in it. The last time it was charged it worked for awhile then cooling stopped so I figured freon leaked again. I didn't bother putting a gauge on it because I was done wasting money on expensive r-12. If I can rebuild compressor, I got one can left to maybe top it off.
I'll rip it off after hunting season and drain compressor oil to see if any shavings are present, possibly just needs a bearing and clutch. I'll put some gauges on it to see pressures as your right it shouldn't run without r-12 in it. The last time it was charged it worked for awhile then cooling stopped so I figured freon leaked again. I didn't bother putting a gauge on it because I was done wasting money on expensive r-12. If I can rebuild compressor, I got one can left to maybe top it off.
Generally once a ball bearing starts making audible noise, it is too late to save it.
#11
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Maybe not for you, but for the thread, not sure what years this works for besides 87-90 >
AC Bypass/Idler pully. (unconfermed) > Get an AC bracket from a 92, go to NAPA to pick up a Dorman AC bypass pulley for a 92 and newer. NAPA # p/n 660-1819. The belt size remains the same. You need to use the pulley spacer that comes with in the hardware bag, it moves the pulley out about an 1/8" so that it lines up perfectly with the rest of the stock pulleys.
AC Bypass/Idler pully. (unconfermed) > Get an AC bracket from a 92, go to NAPA to pick up a Dorman AC bypass pulley for a 92 and newer. NAPA # p/n 660-1819. The belt size remains the same. You need to use the pulley spacer that comes with in the hardware bag, it moves the pulley out about an 1/8" so that it lines up perfectly with the rest of the stock pulleys.
Application Summary: Jeep Cherokee 1993-91, Jeep Comanche 1992-91, Jeep Wrangler 1995-91. There is 3 different pulleys for the 4.0 years apparently.
Sounds exactly like the clutch bearing going out - in a pinch, you CAN sometimes get a couple extra days out of squirting some SAE 30 oil in the clutch/bearing. It is a quick/easy change if you can source the bearing (or better yet a whole clutch kit) without it killing you on time.
Generally once a ball bearing starts making audible noise, it is too late to save it.
Generally once a ball bearing starts making audible noise, it is too late to save it.
Thanks again !
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