Question about AC Cars & Trucks

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Why does my system work great in heat mode but short cycles the compressor in ac mode

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  • AC Master
  • 1,326 Answers

Needs a recharge get a kit with stop leak

Posted on Apr 15, 2015

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  • Expert
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Sounds like your system is low on refrigerant. Auto parts stores sell a kit to refill yourself. Kit comes with easy to follow instructions. I would buy the one with the basic gauge and give it a try. Cost around $25.00

Posted on Apr 10, 2015

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  • AC Master
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Possibly needs recharged

Posted on Apr 10, 2015

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Ac and heater work great but go off. Then Ac blows Hot / heater cold air

I got a bigger coat to wear! while I find time to look into it further. I appreciate knowing there is more help available and will try the Primo Asist plan later. thank you louie

Posted on Nov 04, 2008

  • 2976 Answers

SOURCE: no heat - ac stays on blowing through defrost vents

If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Posted on Feb 01, 2009

  • 834 Answers

SOURCE: Which pins are shorted on AC pressure switch to

You should not have to do anything to charge that AC system, except to start the engine and turn on the AC to maximum, then charge the AC system, when there is enough pressure in the system the low pressure switch will trip the AC compressor on and you can continue to fully charge the AC system.

Posted on Jun 06, 2010

duane_wong
  • 6826 Answers

SOURCE: my 1999 neon ac compressor short cycles. has no

Maybe there is too much refrigerant in the system where the high pressure cutoff switch invokes in short cycles.

Usually, low pressure in the system causes the short cycle/no cold air in the a/c system.

Posted on Sep 24, 2010

  • 39 Answers

SOURCE: replaced ac compressor and now trying tocharge

It wont come on until you have some refrigerant in system.

Posted on Nov 11, 2010

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YOU COULD HAVE OPEN OR SHORT IN THE BLACK YELLOW WIRE GOING TO AC COMPRESSOR CYCLING PRESSURE SWITCH. CHECK FOR A SHORT OR OPEN IN RED YELLOW WIRES AT THE AC PRESSURE CUTOFF SWITCH. USE VOLT METER AND CHECK FOR VOLTAGE AT BOTH SWITCHES. PROBLEM COULD BE IN THE EATC MODULE THAT SEND POWER TO PURPLE WIRE THAT FEEDS THE AC PRESSURE CUTOFF SWITCH AND AC CLUTCH CYCLING PRESSURE SWITCH THEN FEEDS THE AC COMPRESSOR CLUTCH SOLENOID.

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My 1999 neon ac compressor short cycles. has no cold air and also has a full charge.


Maybe there is too much refrigerant in the system where the high pressure cutoff switch invokes in short cycles.

Usually, low pressure in the system causes the short cycle/no cold air in the a/c system.

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Compressor change should have no effect, presuming it is working correctly. Have a qualified shop diagnose the system, there are tons of items involved, pressures, tempratures, heating system, etc. Remember that you are heating OUTSIDE air unless you are using recirculation setting...Hard to lower outside air to cool during the short time that the air is in the evaporator coils.

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Which pins are shorted on AC pressure switch to get the AC compressor to cycle to fill unit with freon?


You should not have to do anything to charge that AC system, except to start the engine and turn on the AC to maximum, then charge the AC system, when there is enough pressure in the system the low pressure switch will trip the AC compressor on and you can continue to fully charge the AC system.

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unless the compresor is on u cant get a good eye on if ther is enough freon but still should cycle on and off/if it has a low side cut out switch (scews in the large line with two wires)that can be checked by bypassing the switch/but mind u it could still have a problem with ac system/and if the ac works when bypassed(very short run time)then replace switch with new one right away,also look for ac clutch relay and check or replace

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Idle Revs With Front Defrost


when you use the front defrost in the winter the cycling of tha a/c compressor will cause this condition.

when you use defrost the a/c is run to de-humidfy the air that is blown onto your windshield.


in the summer this is not a big deal as it is hot enough outside to keep the a/c system pressure above the compressor clutch cycle threshold. but in the winter the general lack of heat in the ambient air and the lack of humidity results in rapid cycling of the ac compressor.

the idle is bumped up to compensate for the load of the a/c compressor, or else your engine would stall out. but when the compressor is disengaged the idle is dropped. but it raises again when the compressor cycles back on.

there may be a good chance that your ac is under charged after all these years. when the weather gets warmer have the charge level in your ac system checked.

a low charge will also increase the on off on off cycling of the ac compressor, usually resulting in the complaint that you have. so the base issue of your problem is low ac system charge.

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Have you checked to make sure your compressor is kicking in when turned to AC mode?

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