Q: Ac compressor clutch isn't engaging on high fan speed setting while it engages on the prior three fan speeds which are all slow.

asked by on

I have a 02 Mitsubishi Lancer ES. My ac compressor will engage the clutch when the fan speed setting is at 1 2 3 and when it is on the high setting which is 4 the compressor clutch disengages. I can have it on 1 2 3 and switch it to 4 the vents blow cold air for about five seconds or so before it hot air again. But with that being said the 1 2 and 3 setting don't work and all three don't work and setting 4 is high. So I either have no blowing air or high blowing air. I've done some research and I do believe this is a bad blower motor resistor. But would the bad resistor have anything to do the the ac clutch disengaging on my high fan speed setting? Or what is at fault?

My car has 136000 miles.
My car has an automatic transmission.

The blower not working is most likely due to a fault with the blower resistor. When you go to high blower speeds the A/C may disengage the compressor if the cycling switch cycles or the high pressure switch gets over pressurized, shutting the compressor off. The first thing to do is to get the blower working correctly then test the A/C pressures using A/C gauges. If you’d like to get this fixed, consider YourMechanic, as a certified technician can diagnose your A/C issue and fix it accordingly. Good luck.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Ac compressor clutch isn't engaging on high fan speed setting while it engages on the prior three fan speeds which are all slow.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hot air coming out of vents

It sounds to me like your AC isn't kicking on. Usually this is caused by low refrigerant in the AC system or a leak. If you need help with repairs, have a certified mechanic, such as one from YourMechanic, come...

Q: No Crank No Start, dashboard lightup with No Bus warning

Considering the problems at hand it may be best for an in person diagnosis of the situation. The problem could be as simple as a failed sensor or broken wire, or the power-train control module itself going faulty. Considering the...

Q: My car won't start and the word fuse is lighting up on my cluster. What does it mean?

Hi there. The fuse light will come on if the engine is not starting up for more than 15 seconds. This is a fail safe light that warns the driver that the starting circuit has a fault and needs attention....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...