Aircond fan sometimes does not turn on when ac is on but ...

Q: Aircond fan sometimes does not turn on when ac is on but turns on when radiator fan is on

asked by on November 23, 2017

My 2002 lexus LS430 aircond sometimes blows warm air but it turns cold as soon as the aircond fan turns on (it turns on at the same time when the radiator fan turns on), But shouldnt the aircond fan be on when the ac is on and turns off when ac is off? Or is it about time for the aircond fan motor to be replaced? This only happens intimmitently though

The a/c compressors are known to intermittently not engage on these vehicles and once the systems pressures are verified and no other component is tested bad then the compressor clutch should be checked to see if it is getting power when not engaging to see if clutch is worn and not engaging. If it is getting power and not engaging intermittently then the compressor may need replaced. Have the system checked for a defective compressor clutch.

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

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

Windshield wipers and horn not working

Hello. The first thing to check is all the fuses. If all the fuse are good, a scanner needs to be connected to car to check for code and data. Everything in the column and steering wheel goes through the...

I have an 01 Lexus ls430 the trunk indicator is on as if the trunk is open but it's completely closed. Any ideas?

Hello, thank you for writing in. Something is wrong with the sensor on the latch for the trunk. Scan the vehicle for diagnostic codes to see if anything comes up. You can check the wiring directly to the sensor and...

Oil leaked out, van ran hot and radiator had a leak oil was splattered everywhere and backed up into the coolant jug 2002 Ford E350 Super Duty

Hello - I suspect you will find blown head gaskets based on the oil in the coolant" observation, with indications of extremely high pressure coming into the cooling system. Hopefully the determination you have that cylinder heads themselves were not...

Related articles

Why Does the Air Coming Through My A/C Vents Smell Bad?
Over time your car A/C system can start to smell unpleasant. If your A/C system smells bad check for mildew in the vents or install a new air filter.
What Sensors in the AC Tell the Car If the System Is Working or Not?
The The average car today contains a bewildering range of sensors that feed information to various computers to monitor everything from air intake to emissions and engine timing. Your car’s air conditioning system also contains a couple of sensors that...
How Long Does an AC Compressor Relay Last?
Your Your car’s air conditioning system needs to be able to pressurize refrigerant in order to operate. The AC compressor relay is an electronic component that turns your AC compressor off and on. Without it, the compressor will not work,...