Question about Cars & Trucks
My A/C compressor kicks on & off every few seconds, low pressure side of compressor is cold, pressure guage indicates my A/C is fully charged and the air blowing out of the vents is about the same as ambient temp. Any idea what the problem might be?
Need to leak check the system,recover the refrigerant,
vacuum out all air & moisture, I would assume was put
in there by any number of people trying to add to it over
the years with no a/c experience & not using the proper
manifold gauge set. Then charge to the correct number
Posted on Jul 11, 2013
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Posted on Jan 02, 2017
Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables.
Service center time, unless you are handy with your own repairs.
Posted on Jan 19, 2009
No ductwork [to the lower vents] under the dash. They are part of the heater core / blower housing is integrated (all one piece).
After reviewing shop manual, we suspect that one of the three damper flaps is not positioning correctly; or debris has blocked one side (which makes more sense given the symptoms).
We're waiting for the temperatures to get back in the plus numbers to check out the physical arrangement.
Posted on Jan 21, 2009
If it is above 100PSI, you are over charged. Any thing under, should be normal to low. You probably need to get it checked by a professional to make sure it has the correct charge, and the compressor is getting power when the switch is turned on.
Posted on Jul 14, 2009
SOURCE: 2001 Tahoe LT 5.3.
There's a feed from the engine coolant temperature sensor into the AC controller as if the controller thinks the engine is overheating it'll shut down the AC to reduce the load on the cooling system
Try unplugging the cooling sensor on the engine ( follow the radiator top hose back to the engine as the sensor is close to this) and see if this replicates the problem, if it does then you know thats the issue.so the coolant temperature sensor needs to be replaced.
-------------- Also the possibility is faulty evaporator temp sensor.It may be sending a false signal to the climate control module that the evap is around freezing temperature thus shutting down the compressor. The evaporator temp sensor is located on the evaporator housing, in the a/c system, and monitors the temp to prevent the evaporator from freezing up. If the AC control module sees the temp going too low, it will send a communication message to the pcm to turn off the a/c compressor until the evap temp returns to an acceptable range. The other possibility is the high pressure switch located on the line in the right hand side whell arch. Why I mentioned the high pressure switch because as the temp increases the pressure in the system increases and if the ECU sees this signal from that pressure switch in the wheel well on the a/c line it will shut down the compressor. You can test this with a digital voltmeter or install a set of gauges to the high and low side service ports and see where the pressure go. It also may be the temp sensor element on the compressor itself. ----------- This should help.Thanks.Helpmech.
Posted on May 29, 2011
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