Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>
>Is the AC/heat selector in the defrost position?


Thank you for helping. Actually it is not. The clutch runs from the time the
key is turned till I turn the car off. Non stop. Even if I wanted just the
fan to work it still cranks and cranks. If I try to turn the heat on for the
little while it works I get hot AC. It's the weirdest thing I have ever seen.

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>
>Is the AC/heat selector in the defrost position?


Thank you for helping. Actually it is not. The clutch runs from the time the
key is turned till I turn the car off. Non stop. Even if I wanted just the
fan to work it still cranks and cranks. If I try to turn the heat on for the
little while it works I get hot AC. It's the weirdest thing I have ever seen.

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>
>Is the AC/heat selector in the defrost position?


Thank you for helping. Actually it is not. The clutch runs from the time the
key is turned till I turn the car off. Non stop. Even if I wanted just the
fan to work it still cranks and cranks. If I try to turn the heat on for the
little while it works I get hot AC. It's the weirdest thing I have ever seen.

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Viclos wrote:
> DougW wrote:
>>> Please hep me. I have spent the last two days trying to see if anyone
>>> else had posted this problem on this web site but nothing quite fit.
>> [quoted text clipped - 20 lines]
>>> Again, can this be connected to the same issue or is there something
>>> else I should be checking. Thank you for all your advice.
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>>
>
> Thank you for taking the time to help. I was there and I saw my mechanic take
> the relay out and the clutch kept right on going like nothing had happened.
> Then when he disconnected the wire it stopped becuse it had no power and he
> used a pen tester and there was power coming from the wire itself evethough
> the relay was still out of the housing. I will try your remedy and will
> respond again by the morning. Do you think the other problems could be
> associated to this as well?? Thanks again.
>

Follow the wire from the compressor back and see if the insulation has failed.

I had to replace the computer in my large car because the wires had touched.
5 volt inputs don't like 12 volt sources!!

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Viclos wrote:
> DougW wrote:
>>> Please hep me. I have spent the last two days trying to see if anyone
>>> else had posted this problem on this web site but nothing quite fit.
>> [quoted text clipped - 20 lines]
>>> Again, can this be connected to the same issue or is there something
>>> else I should be checking. Thank you for all your advice.
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>>
>
> Thank you for taking the time to help. I was there and I saw my mechanic take
> the relay out and the clutch kept right on going like nothing had happened.
> Then when he disconnected the wire it stopped becuse it had no power and he
> used a pen tester and there was power coming from the wire itself evethough
> the relay was still out of the housing. I will try your remedy and will
> respond again by the morning. Do you think the other problems could be
> associated to this as well?? Thanks again.
>

Follow the wire from the compressor back and see if the insulation has failed.

I had to replace the computer in my large car because the wires had touched.
5 volt inputs don't like 12 volt sources!!

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Viclos wrote:
> DougW wrote:
>>> Please hep me. I have spent the last two days trying to see if anyone
>>> else had posted this problem on this web site but nothing quite fit.
>> [quoted text clipped - 20 lines]
>>> Again, can this be connected to the same issue or is there something
>>> else I should be checking. Thank you for all your advice.
>> Does the clutch run with the relay out? With the clutch wire disconnected?
>> If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>>
>
> Thank you for taking the time to help. I was there and I saw my mechanic take
> the relay out and the clutch kept right on going like nothing had happened.
> Then when he disconnected the wire it stopped becuse it had no power and he
> used a pen tester and there was power coming from the wire itself evethough
> the relay was still out of the housing. I will try your remedy and will
> respond again by the morning. Do you think the other problems could be
> associated to this as well?? Thanks again.
>

Follow the wire from the compressor back and see if the insulation has failed.

I had to replace the computer in my large car because the wires had touched.
5 volt inputs don't like 12 volt sources!!

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>>>> Please hep me. I have spent the last two days trying to see if anyone
>>>> else had posted this problem on this web site but nothing quite fit.
>[quoted text clipped - 13 lines]
>> respond again by the morning. Do you think the other problems could be
>> associated to this as well?? Thanks again.
>
>Follow the wire from the compressor back and see if the insulation has failed.
>
>I had to replace the computer in my large car because the wires had touched.
>5 volt inputs don't like 12 volt sources!!

All,
I can't see the wire this late at night but I will check it in the morning. I
did try doing what DougW suggested regarding switching the relay from the
fog light to the AC and the same result. I did make one huge mistake in the
description of my problem. The clutch is not what is contantly running it is
the evaporator. It starts to form a white film as soon as the car is turned
on and freezes within just minutes. The clutch only runs when the car is on.
When I turn the fan on the it kicks out cold AC. It only understands AC. If I
try to turn it to 4 (high speed) then it start to hum and no air comes out at
all. The same thing happens when I am entering the highway and have to
accelerate quickly. The air flow cuts totally out and the loud hum start
again. It's like inhaling really fast. That's the sound it makes. Then if I
slow down 10-15 miles an hour it will kick back on but as soon as I speed up
again it does the same thing again. I did take a look under the glove
compartment and there are three more large black relays which I do not know
what they are for but I am willing to bet that one of those suckers is
causing me all this trouble. Do you or does anyone know what each of those
three relays do? I gamble once in a while and I would bet the house that the
problem lives there. Please reply when you can and have a great night.

--
Message posted via http://www.carkb.com

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>>>> Please hep me. I have spent the last two days trying to see if anyone
>>>> else had posted this problem on this web site but nothing quite fit.
>[quoted text clipped - 13 lines]
>> respond again by the morning. Do you think the other problems could be
>> associated to this as well?? Thanks again.
>
>Follow the wire from the compressor back and see if the insulation has failed.
>
>I had to replace the computer in my large car because the wires had touched.
>5 volt inputs don't like 12 volt sources!!

All,
I can't see the wire this late at night but I will check it in the morning. I
did try doing what DougW suggested regarding switching the relay from the
fog light to the AC and the same result. I did make one huge mistake in the
description of my problem. The clutch is not what is contantly running it is
the evaporator. It starts to form a white film as soon as the car is turned
on and freezes within just minutes. The clutch only runs when the car is on.
When I turn the fan on the it kicks out cold AC. It only understands AC. If I
try to turn it to 4 (high speed) then it start to hum and no air comes out at
all. The same thing happens when I am entering the highway and have to
accelerate quickly. The air flow cuts totally out and the loud hum start
again. It's like inhaling really fast. That's the sound it makes. Then if I
slow down 10-15 miles an hour it will kick back on but as soon as I speed up
again it does the same thing again. I did take a look under the glove
compartment and there are three more large black relays which I do not know
what they are for but I am willing to bet that one of those suckers is
causing me all this trouble. Do you or does anyone know what each of those
three relays do? I gamble once in a while and I would bet the house that the
problem lives there. Please reply when you can and have a great night.

--
Message posted via http://www.carkb.com

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Scott in Baltimore wrote:
>>>> Please hep me. I have spent the last two days trying to see if anyone
>>>> else had posted this problem on this web site but nothing quite fit.
>[quoted text clipped - 13 lines]
>> respond again by the morning. Do you think the other problems could be
>> associated to this as well?? Thanks again.
>
>Follow the wire from the compressor back and see if the insulation has failed.
>
>I had to replace the computer in my large car because the wires had touched.
>5 volt inputs don't like 12 volt sources!!

All,
I can't see the wire this late at night but I will check it in the morning. I
did try doing what DougW suggested regarding switching the relay from the
fog light to the AC and the same result. I did make one huge mistake in the
description of my problem. The clutch is not what is contantly running it is
the evaporator. It starts to form a white film as soon as the car is turned
on and freezes within just minutes. The clutch only runs when the car is on.
When I turn the fan on the it kicks out cold AC. It only understands AC. If I
try to turn it to 4 (high speed) then it start to hum and no air comes out at
all. The same thing happens when I am entering the highway and have to
accelerate quickly. The air flow cuts totally out and the loud hum start
again. It's like inhaling really fast. That's the sound it makes. Then if I
slow down 10-15 miles an hour it will kick back on but as soon as I speed up
again it does the same thing again. I did take a look under the glove
compartment and there are three more large black relays which I do not know
what they are for but I am willing to bet that one of those suckers is
causing me all this trouble. Do you or does anyone know what each of those
three relays do? I gamble once in a while and I would bet the house that the
problem lives there. Please reply when you can and have a great night.

--
Message posted via http://www.carkb.com

Re: 97 JEEP CHEROKEE SPORT A/C CLUTCH RUNS CONSTANTLY
 

Viclos wrote:
> DougW wrote:

>> Does the clutch run with the relay out? With the clutch wire
>> disconnected? If so, the clutch might be frozen.
>>
>> Also possible the relay is bad. swap with fog light relay and test.
>>
>
> Thank you for taking the time to help. I was there and I saw my
> mechanic take the relay out and the clutch kept right on going like
> nothing had happened. Then when he disconnected the wire it stopped
> becuse it had no power and he used a pen tester and there was power
> coming from the wire itself evethough the relay was still out of the
> housing. I will try your remedy and will respond again by the
> morning. Do you think the other problems could be associated to this
> as well?? Thanks again.

This is for a 1993 ZJ. Your model might be different but without a schematic I can only guess.

----------------------------------------------

Power to the AC clutch flows like this.

Battery--fuse--->LowLimit Switch-->HighLimit Switch--->relay----->AC Clutch Positive
The relay is similar to this one.
http://www.revbeergoggles.com/temp/relay.jpg
http://www.revbeergoggles.com/temp/relay-diagram.jpg

If the AC relay was pulled and the clutch was still working, then there is a short in the relay center.

Try disconnecting the high limit or low limit switches. Just disconnect
the wire and that will cut all power to the relay
(low limit is on the accumulator, high limit is on the back of the comressor)
Ref: http://revbeergoggles.com/Fixes/diag...s.html#sensors

If disconnecting the limit switch doesn't stop the clutch then your short is
betwen pins 16 and either 18 or 19

If disconnecting the limit switch stops the clutch then the short is between
pins 17 and 19

--
DougW