Question about 2002 Pontiac Montana

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No 12v to air compressor cluch

I get continious power to ac clutch relay coil. I want to know if he should get off when swith is at off.

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  • Pontiac Master
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Yes, it should

Posted on Jul 14, 2009

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04 navigator is blowing ac fuse 11, ac coil shorted, 3 different coils, can ac compress short the coils


How did you hook up the inline fuse to compressor and ground to compress ? Ground what ? Right at the clutch coil ? You have to be hooking it up wrong . The compressor can't cause the clutch coil to short or blow the fuse , even if the compressor were seized up . An before that would have the serpentine belt would burn up , squealing noise. applying B+ voltage in the relay socket ,pin 30 to pin 87 will engage the compressor clutch . If the fuse blows the wiring from the relay to the compressor clutch is shorted to ground . Look for rubbed through wiring harness .

Jul 14, 2017 | Ford Cars & Trucks

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AC fuse and relay for 2001 Ford Expedition


Pull a relay out and use paper clip to jump. Usually cross corner. Watch compressor clutch and see if engages when key is turn ahead. Don't start car. If it does good. Now take alligator clips and check relay. Clip each wire to negative and positive battery post. Then clip negative to negative relay pin. And touch positive to correct pin. If it doesn't click do it another relay so you know your doing it right. If determined relay is good. And your compressor clutch did engage when testing it. You are low on freon.

Jul 11, 2016 | Ford Cars & Trucks

2 Answers

2008 honda accord air will not work ,has freon ,relay works but compressor will not kick on.


#1 top A/C post here ever. bravo that.
this is caused by by the AC brain.
(location varies by year, and country)
A/C brain discrete, cira 90s
to after 2007 , they moved the brain, now pure software inside
the ECU or BCM , on most cars.
it really dont matter much where it is until you get to back probe the bugger. right?
so , here is the reasons for A/C clutch dead.

1:clutch bad, apply 12v to it see if it works (wires discon, please)
do so for on 1second, so as not damage system.
check for coil ohms near 1ohm. at clutch.
infinity is bad coil.
OR do :
1b" 12v to coil AC on? any volt meter works. 11 to 15v typical.
13.3 to 14.7 running engine typical.
yes, clutch dead.
2: 12v not at coil of clutch bad relay.
3: relay coil not energized.
3a: power to relay not on coil, if yes, bad relay .
3b: relay coil dead. no power. the brain has it shut down!

4: the brain, stops the AC for all these reasons
simple answer , inputs wrong.
full answer:
a: too low freon pressure, in truth or sensor fibbing
b: too high freon pressure, same, reasons.
c: ENGINE over load, (pulling trailer or going WOT )
d: engine overheat. (ecu say so or AC has its own sensor saying so, RTM.
e: Evap core (the cold core in dash) has frozen over to a ice brick. (a freeze sensor is there) caused by stuck open expansion valve. in core.
f: no power to AC brain, 90s cars. or missing ground,
g: AC not on, or brain can not see fan going, usual the is just
the 12vdc to fan missing. or the wire fell off.

some cars have all this, my 96 does.
on newer cars the ECU can shut the AC down for many reasons.
most are related to safety to the driver, or Compressor.
for what reasons, only the FSM answers that , and varies
by year, engine type, model and country sold.
if in usa , you didnt say. then alldata dot com has these facts
and more , under section called HVAC.

The brain will not allow you to burn up the compressor or worse.
it tries very hard at that. even as old as 1991 cars. (some)
today all.

Oct 12, 2013 | 2008 Honda Accord 2.0i-VTEC

1 Answer

No power to a/c compressor clutch and relays and fusses are fine as well as wiring


no country , no car, now year, stated, wow. that is a hard row to hoe.
the clutch is energized by the relay
the relay is energized by the A/C brain or directly by the BCM or ECU. (varies by year, make and model car and country)
why you are getting no where fast is for 1 reason, well 2.
1: no voltmeter.
2: no FSM (or at the least the correct A/c schematic.0

if you ground the meter black lead to the battery minus lug.
20vdc scale or autoranged on volts.
you then probe all 4 relay pins.

1: power, 12v , no then bad fuse
12v good.
2: relay coil, put meter cross the coil pins on relay.
got 12v. , yes, good no , the brain has shut off the AC.
yes, 12v,
now put ground lead back on meter.
3:
is the relay contact output at 12v, (coil is hot step 2)
is the output 0v, ? bad relay.
is the output 12, good, clutch is dead, or wire cut.

this works on all relays,

now what if the brain (worst case, you didnt spec car)
if the brain is shutting down AC.
here is the list.
1: engine is overheated. (some A./c systems have own thermal switch for this , others (newer cars) just talk to ECU to find this out.
2: engine ECU is reporting engine OverLOADED. or WOT.
3; no power to A/C brain. Fuse
4: Evaporator core froze up (ice blockage) (bad expansion valve?)
5: Freon loop, is too high pressure.
6: Freon loop, is too low pressure.
7: some cars, other things.... RTM ,read the FSM.

are you now totally at information overload.
that is why the mech was born to handle all this details.

if you are DIY handy , all this and more is at alldata dot com.
its there all the time. just look, and ask questions )_

Oct 10, 2013 | Cars & Trucks

1 Answer

1999 GMC air cond. AC clutch wont engage. system is charged. relay, fuze,and low pressure switch are replaced.


ac compressor clutch coil open or short. wire cut or open to ac clutch.2 wires one is ground the other power, remove connector ac compressor then probe with test light between the two wire

Aug 05, 2013 | 2003 GMC Sierra 1500

1 Answer

New compresser just stopped working was very cold ran it all day and now the compressor is not kicking in and out how can you tell if it is a relay or loss of carge


FIrst, with any electrical problem, always check the fuses first. The only way to correctly check the charge of the AC system is with a set of guages. You can assume the charge is good and procede with the electrical diagnosis, but it may all be a waste of time if the system has lost the charge. With the AC on, if there is a proper charge in the system, there should be 12v at the compressor clutch connector. This will be a 2 wire connector just behind the AC pulley. You will need a 12v test light, meter, or some way to check for voltage. If there is 12v and the compressor is not engaged, then the clutch coil has gone bad. If there is not 12v then you will need to check the relay for voltage. Sometimes you can swap relays with another that has the same part number. If the original relay is bad then the compressor will start working after the swap. Check all the fuses, under the hood and under the dash. Sometimes a fuse will control more than one circuit.

Jul 30, 2011 | 1994 Oldsmobile Cutlass Ciera

2 Answers

I have a 02 lincoln ls. the problem is i cant get air conditioning to work. I have took it to a local shop they check all pressure swithes, compressor is fully charged, relays and fuses are good, they...


Your AC mechanic is a know nada POS. Your AC is not working because the clutch is not being properly energized so as to turn the compressor which as you indicated is working and fully charged. Either the climate control head you just got is no good, ditto for the low pressure cut off switch, thermostat.. Best thing to do is get a hold of someone who has the AC schematic and can check out all of the electrical components in the way of getting power to the clutch!

Apr 24, 2017 | 2002 Lincoln LS

3 Answers

Have no power to the ac compressor. all fuses and


SOUND LIKE AC COMPRESSOR CLUTCH COIL IS OPEN.ITS GETTING POWER YOU HAVE A OPEN COIL CIRCUIT.

May 27, 2010 | 2002 GMC Yukon Denali

2 Answers

AC Compressor not engaging on 2000 Chevy Impala. Fuses and AC relay okay. No power at compressor. Need wiring diagram. Also need to know if compressor requires 12v for operation. If not what should voltage...


When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Apr 20, 2010 | 2000 Chevrolet Impala

2 Answers

My 96 Camry a/c switch (as well as the defroster)


The pressures of the refrigerant must be close or the system pressure sensors will not let the AC cluch pull in. AC is just not wise for DIY without some gauges and knowledge. Sorry.

Jun 29, 2009 | 1996 Toyota Camry

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