Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161208-99848-wyk4gmjs:136:3912)
    at m.mountComponent (/tmp/execjs20161208-99848-wyk4gmjs:47:15602)
    at /tmp/execjs20161208-99848-wyk4gmjs:49:31860
    at a.r.perform (/tmp/execjs20161208-99848-wyk4gmjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161208-99848-wyk4gmjs:49:31821)
    at r (/tmp/execjs20161208-99848-wyk4gmjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161208-99848-wyk4gmjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161208-99848-wyk4gmjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161208-99848-wyk4gmjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161208-99848-wyk4gmjs:173:8

Q: Squealing from AC Clutch

asked by on

With the vehicle in idle and the AC on Max AC the vehicle has an intermittent squealing sound. Vehicle is in Park. If I take the Max AC off the AC blows warm air. If Max AC on the Air is cold. Please help.

My car has 98000 miles.
My car has an automatic transmission.

A: The A/C compressor has an electrically cont...

The A/C compressor has an electrically controlled clutch mechanism, part of which is visible. The clutch is adjacent to the A/C compressor pulley that has the serpentine belt on it.

When the car is running, and A/C is off you should see the pulley only turning. As you view the pulley turning, have an assistant turn the A/C on max. Make sure car is in park with emergency brake on and wheels are blocked. Do not stand in front of the car, stand to the side.

When your assistant turns A/C on max (blower on, too) you should see the clutch turn with the pulley. That signifies that the compressor is at least "turning" as the clutch is now locked to the pulley.

Now, have the assistant turn max "off" (i.e., use regular A/C setting). The clutch should still be engaged and turning with the pulley, although the clutch might cycle on and off which is normal as the cooling load will vary. If the clutch does not engage with the "normal A/C" setting there is a problem, possibly electrical but also possibly related to the level of refrigerant charge.

You should check the refrigerant charge using a manifold to confirm that pressures are within normal range (if pressures are too low, there is a switch in the system that will shut down the compressor because low pressure does not adequately lubricate the compressor; it is a safety switch).

The squealing sound could have a variety of causes: A/C clutch slipping (in turn would have a variety of causes); belt is damaged, old and worn; misaligned belt pulleys including that on harmonic crankshaft balancer; damaged or dried out (grease) pulley bearings; A/C compressor shaft bearing is bad.

If you feel like this repair may be over your head, have one of our mobile technicians perform these checks and diagnose the issue with your A/C system for an accurate repair. Best of luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Were is my knock sensor on my vehicle?

Hello. The location of the knock sensor would be dependent on which model of engine your 4Runner is equipped with. Knock sensors are usually bolted directly to the engine block, as they are designed to monitor and detect engine knock...

Q: AC blowing warm air

Hi. The problem your described is an indicator that the coolant fan for the condenser is not working properly. If the fans are working properly, I suggest having the refrigerant pressure check by an EPA certified technician. If you need...

Q: What's wrong with my car?

This may actually be a faulty throttle position sensor. The throttle position sensor is used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. Based upon...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...