My AC seems like it runs on fan mostly. It's not cooling. It cools when the compressor kicks on, but it doesn't stay on very long...no matter how low I have the thermonstat. Any suggestions?
Thanks,
Tony
You may have thermostat problems. If the blower and compresssor kicks on, that indicates their ok. If you have a two wire thermostat, you can tie those wires together to see if the unit will operate. BE SURE TO DISCONNECT POWER.
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Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.
I didn't know it had a light on the dash that said "cooling fan temp". My 93 doesn't. The cooling fans are controlled by the computer and turned on when the ac is running or when the engine reaches 220 degrees. A mechanic would check the fuse and relay for power and the fan motor for power and ground.
I passed this question the first time I read it, so I will take a stab at it now. The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch. I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ? Speeding up the engine would increase voltage from the alternator. This is assuming the serpentine belt is tight and everything else is working correctly. I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.
Your ac system is most likely low on freon, or the cooling fan is not working. When you turn on the ac the cooling fan should stay on. If it stays on then you are low on freon.
HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.
if you can here the compressor kick on (the fan will also be running) if the compressor is running and not cooling you could have a leak and it needs fixed and recharged
You say temp fan?If you mean the cooling fans,then the ac is out of freon most likely,the freon has to be in the system,and enough to kick the compressor on,therefore turning the cooling fan on.
Sounds like control voltage problem. Tsat mat be bad. It is hard to say without looking. Next time this happens. Have someone stands out side by the unit to see if the contactor is pulling in. When you turn the Tstat off and wait and turn it on you may be manually make the contact in the Tstat. If the fan and compressor are not running when you call for cool, Most of the time it is the control voltage. Let me know if the outside fan runs and the compressor does not. Rusty
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