Question about 1997 Chevrolet Suburban

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A/c compressor clutch will not turn on - 1997 Chevrolet Suburban

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  • papasquaty Sep 23, 2008

    My a/c compressor clutch will not turn on the switch inside is on but nothing. I found this problem when trying to recharge my a/c.

  • jmoos Sep 26, 2008

    I have teh same problem I found a relay in the fuse pannel under the hood for ac not sure if that could cause the problem

  • aloby Sep 30, 2008

    yep me too.......I started to recharge it but the compressor never comes on

  • Anonymous Apr 03, 2009

    Was told my a/c clutch relay was bad. It is supposed to be located "somewhere" under the dash!! Anyone know where?

  • herbert 123 Apr 23, 2009

    i turn my Ac from my nissan versa on but the cluch go not on it is no power on the plug

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I am currently working on my A/C and I am learning a lot. If your clutch is not engaging, it may be due to low coolant or the low coolant sensor could be bad. To test the sensor, remove the plug from the accumulator and use a jumper between the pins. If the clutch comes on and you have verified sufficient freon, your sensor is bad. As far as the relay is concerned, it is co-located with the starter relay under the hood (on my 97 Sub). The part numbers are the same and they can be swapped. I am only familiar with my vehicle and can only imagine that many systems run similar. I hope you can use this info.

Posted on Apr 08, 2009

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3.9 V6. How can I remove the A/C clutch?


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google J 37872 - to see tool !

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My 94 grand marquis shut off seconds after a loud grinding noise that sounded like it was coming from the front left hand side. I tried turning it back on after it happened and the check engine and oi


I interpret this as the Passengers side of your car. Usually the serpentine belt breaks when the A/C compressor seizes. That is the part which is probably grinding or the A/C clutch bearing is seized.

Although this is Winter, the Defroster is made to activate the compressor to lube it during the Winter. Now the pulley that turns the compressor has a clutch bearing. It is ALWAYS turning when the engine is on except when electricity is applied to the compressor clutch and it locks and turns the A/C compressor shaft.

What needs to be done now is to determine if the A/C clutch bearing is bad or if the A/C compressor is bad. Most A/C clutch bearings can be removed and replaced. SOME of the bearings within the A/C clutch can be changed and then they are as good as new.

The procedure for replacing the bearing is 1 step beyond replacing the entire A/C clutch. The fan shroud must be removed, the serpentine belt must come off, then a small bolt and a retaining clip must be removed and the clutch slid off the compressor.

There is no need to remove the compressor or lose Freon. The bearing situation can be determined once the serpentine belt is removed and the parts turned by hand.

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1 Answer

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1) TEST the fuse+ relar of a/c
see the next steps and fix it. God bless you
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged

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1 Answer

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proceed according and fix it. God bless you
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged

10_5_2012_12_14_20_pm.jpg

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1 Answer

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An A/C clutch will not make this concern happen, more likely the A/C compressor is begining to go out. The belt on the A/C clutch Assy. free wheels (spins feree on the pulley) when clutch is not engaged. If concern is not present with A/C off this means the bearings in the puley assy. ok. Once the A/C clutch is engaged it locks the compressor against the spinning pulley and turn the compressor chaft and spins the A/C compressor internal shaft. If you hear a loud "screach" when you turn on the A/C it means the belt slipped for a second, if it continiues to screach it means either the belt is loose or that the compressor is internaly locking up. I wouild start by checking the belt tension (if not equipted with and auto tensioner). You can also remove the belt and turn on the A/C and attempt to turn the clutch/pulley by hand, it should turn with a little effect but should not bind or lock at times if that happens compressor is bad.

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1 Answer

How can you tell if the a/c clutch or the a/c compressor is going out if the noise is coming from the same location as well as the compressor still blowing cool air?


This answer is a little tricky to understand unless you read it carefully.

The compressor clutch has an idler bearing in it. This means the clutch can constantly make noise while it turns and the compressor is off. On an individual basis, each bearing is unique by the amount of bearing wear has occurred. Most will be quieter when engaging the compressor in "lock" position, but a bearing missing rollers can be loose in the locked position and be lopsided in how it grips the compressor. The pulley will not roll true or straight to the rotating compressor shaft.

The compressor can make noise separately from the clutch because it needs an internal oil supply for its bearings. There are A/C oil cans and
Freon cans with oil in them. Just like motor oil, there are differences in what type of oil the compressor takes. It is relatively inexpensive to add this type of oil to renew the life of the compressor.

When the compressor is turning, the inner pulley will be locked to the front pulley clutch and both pulleys will be turning. If there is a rumbling sound, it is likely the compressor, but try oil first. The compressor is a pump. It is not silent. You can expect to hear the muffled chirping or clicking of internal valving as it forces compressed gas or liquid past the valving. The valving clicks or chirps as it keeps the flow from backing up into the compressor head.

For a time, the compressor will cool as long as it turns and the clutch turns the compressor shaft. If the bearings inside the compressor seize up, it will probably break the serpetine belt. If the compressor clutch bearings fail, they will start making noise both when the A/C is off and when the A/c is on.

Many times a clutch will be changed only to find that the compressor is also bad. It is not a 1 to 1 relationship. A guess would be a 1 in 10 or 20 occurrence. And it is something even the best mechanics may misdiagnose. This is why sometimes a compressor is included as part of the total estimate, a worst case senario.

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1 Answer

My air conditioner is blowing warm air on the driver side and cold on the passenger side


see this steps and think with clearly and logically NOT feared. God bless you
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged.

7_25_2012_8_45_21_am.jpg

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2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

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1 Answer

03 Chevy Tahoe stalls out while taking a slow


have the a/c compressor checked, the a/c compressor might be locking up due to wear and bad bearings. one way to test is to try turning the compressor clutch while the ENGINE IS OFF, if the clutch is very hard to turn or won't turn at all by hand then the compressor is bad. the clutch is what turns the pully, the pully should spin freely, the compressor clutch is on the end of the compressor on the pully side.

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1 Answer

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you sar has a clutch i have not find any car without clutch,
does that answer your question? the clutch is the part of the pulley at front of the compressor that does not turn until you turn the a/c on and then start turning

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