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Location for ac relay for 99 mustang please. voltage to low pressure, but not to clutch.

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THE A/C RELAY IS UNDER THE HOOD IN A BLACK PLASTIC BOX. YOU MAY NEED THE OWNERS MANUAL TO LOCATE IT, IF THERE IS NO DIAGRAM UNDER THE BOX COVER. HOPE THIS HELPS. GOOD LUCK. THANK YOU IN ADVANCE FOR AN HONEST RATING AND FOR USING FIX-YA.

Posted on May 09, 2009

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2011 Nissan Rogue a/c compressor wont turn on. No voltage to the clutch. Fuse under the hood is good. check engine light is on. P0420 catalyst system efficiency below threshold Bank 1. Please advise


Your check engine light has nothing to do with the A/C system. It is telling you that you probably have a bad O2 sensor in bank 1. As far as your A/C system you could be low on freon and not making the low pressure limit switch, or could be a relay. Hard to tell, you will need to do some trouble shooting to find the cause. Or take it to a competent shop.

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Where is the ac low pressure switch located


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I have a 2001 Ford Mustang V6, the ac is blowing warm air. We checked the refrigerant and it is full. The ac compressor will kick on for a few seconds and then kick off. Why is the compressor not staying...


it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
report reulsts.

please don't forget to rate.

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Ac problem no voltage to ac clutch on dodge caravan 1999 3.3 eng


If you do not have enough refrigerant in the system. The low pressure switch will prevent the compressor from engaging to avoid damage.

Check your pressure.

I don't recommend this, but you may need to jump your low pressure switch to get the compressor going to add more refrigerant to the system. But if your low on charge, it may be "best to take it to a shop to have them fill the system".

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2002 ford mustang air conditioner stopped working. How do I locate the problem?


FIRST I CHECK ALL FUSES AND RELAY.TO BLOWER MOTOR IF IT STOP BLOWING.AND CHECK FUSE TO HVAC SWITCH CONTROL.AND CHECK FUSE / RELAY TO AC COMPRESSOR.IF FUSE / RELAY GOOD POWER GETTING TO AC COMPRESOR CLUTCH COIL AND LOW PRESSURE SIDE 28 PSI AND HIGH SIDE 200 PSI. CLUTCH COIL IS OPEN.IF REFRIGERANT LEVEL LOW YOU MAY NEED MORE REFRIGERANT.YOU NEED AT LEAST 28 PSI ON LOW SIDE AND 200 - 220 PSI ON HIGH SIDE.IF ALL IS GOOD STILL NO AC PROBLEM COULD BE A FAULTY AC CLUTCH CYCLING PRESSURE SWITCH.

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2002 ford mustang ac will not come on. Problem is intermittent. I have checked the low and high pressure switches and fuses. what else is there to check?


When the ac acts up,test voltage at the ac clutch,if there is voltage(12 volts to 14)then the clutch is the problem,also,try and wiggle the low pressure switch ,to see if it tries to come back on,,,have some one put some ac gauges on the ac system and let the ac run,and watch to see if the low side falls down to 25 psi or lower,if it does,then the orifice tube is stopping up.If this was at all helpful,please rate,thank you.

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1 Answer

I have a 91 dodge colt that the ac clutch is not engaging. All other parts of the ac are working. The ac compressor relay has voltage to the coil but the ground circuit from the engine control unit is not...


if the freon pressure is too high or too low there are two seperate pressure sensors that will disable the a/c clutch to prevent dammage to the compressor. You need to check (or have it checked, dangerous if you do not know how) the pressure on the high and low ports while you have you jumper wire in place and the a/c is running. PLEASE RATE MY solution as I am new on here, Thanks

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jumper the low pressure switch on the Acc. if the AC runs, check the charge on the A/C if the charge is correct. replace the LPS.

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1 Answer

My ac is not working on my 2000 mustang 3.8L. I'm getting power from the compressor and I had the clutch replaced. We jumped the low pressure switches and then replaced the fuses. The clutch will still not...


You were close! Most Fords have a CCRM (Continuous Control Relay Module) thats on the passenger side fenderwell. It has 4 relays: one for the AC compressor cluth, one for the fuel pump, and two for the electric fan (high- and low-speed.) The AC is the one that fails the most. You can replace the CCRM by removing the intake air filter box and working through the fenderwell openings. If it gets to difficult you must remove the wheel and splash cover to replace it from the wheel opening.

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