Question about 2003 Honda Civic

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The freon is full ac low pressure switch good all fuses and relays good i also switched the fuses around still the ac do not turn on

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Check the A/C Heater Fan Control Switch located in the dash to see if the switch is supplying power to the relay when itis turned on.

Posted on Jun 05, 2010

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1 Answer

Ac clutch won't engauge


Relay will not engage if pressure switch thinks freon is low. This switch does sometimes fail. If you are sure freon is ok, use jumper wire to bypass low pressure switch and see what happens.

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Compressor wont turn on even I already turned on the A/C


A mechanic would check to see if the system is full of freon, then check the fuse, relay, low pressure switch, and the ac clutch for power.

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No current to ac compressor


A mechanic would start at the compressor and work back.
Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ?
You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.

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Ac clutch not kicking on


ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.

Jul 22, 2012 | 1991 GMC K2500

1 Answer

Ac not working not a fuse or relay ?


The accumulator or dryer looks like a long cylinder, it has a pressure switch on it and two wires attached to it. pull the wired molex off, with the ac set on max cooling, jump out the two wires with a wire or paperclip, if the clutch on the ac compressor engages, check the cab to see if its cooling, if it does cool the switch needs to be replaced, if it does not cool, you may need freon, and there could be a sign of a leak in your system, that can be best checked with ac manifold guages. the low pressure switch is there for safety if the canistor or accumulator is low or has no freon the switch opens up and keeps the clutch from running so that the compressor will not burn up. good luck!

Jul 03, 2012 | 2000 Chevrolet Silverado 2500

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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.

Aug 16, 2010 | 2002 Ford Mustang

4 Answers

A/C is blowing hot air. Freon is full, compressor


Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.

Jul 16, 2010 | 2004 Kia Sedona

1 Answer

I have a 2006 chevy duramax 2500 6.6L diesel ac does not come on. Freon is good fuses ok relay ok pressure sensors ok. Compressor ok i can manually turn it on by grounding ac relay on. only thing left is...


some of these newer ac systems use safety pressure switches on the low and the high pressure lines , ck and see if yours has 2 and ck accordingly,,,goodluck...

Jul 07, 2010 | 2006 Chevrolet Silverado 2500HD 2WD

2 Answers

No voltage to a/c clutch, freon pressure fuse and TCM module check OK , where is freon low pressure cut-off switch located ; 1999 chrysler LHS


put it on a special machine to weigh the amount of gas in the system by extracting it ,then refill to the correct weight of gas ,if still not working then work backwards looking for the feed and try to isolate the problem ,like the AC on switch and then the blower motor switch

Apr 03, 2010 | 1999 Chrysler LHS

2 Answers

No power for AC compressor


try removing the plug off the low pressure switch on the accumalator plug a paper clip into the plug and turn ac on if it comes on then your low pressure switch is bad or your low on refigerant.

May 28, 2009 | 2000 Chevrolet S-10

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