Question about 2002 Chevrolet TrailBlazer

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I have changed the fan clutch and waterpump now there is a constant screeching noise when u slowly pour water on the belt it will stop for about 20 secs.What could it be?

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Need to change the belt as it could be worn or tighten it more. There is a gauge to checks belt tension. Would be useful as overtighting could cause bearings to were over time

Posted on Feb 08, 2010


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My question is related to the previous thread. However id like to reitterate the problem so that whoever stumbles upon this thread on google could help them immensely. I bought my mitsubishi montero sport...

There are two fans in a vehicle, One is in the engine compartment and is for the radiator. The other is in the passenger compartment and it runs the heater and air conditioner air flow from the plenum. The condenser is near the radiator and the evaporator is in the plenum. Condensers don't fail. Neither do evaporators. If the squeal is coming from the engine compartment when the air conditioner is turned on, the problem is either the belt to the COMPRESSOR or the CLUTCH on the compressor.

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Bmw 318i 1996 screeching belt

It might not need to replace the belt but to adjust (tighten) them. Check for a loose one and adjust it. Does the noise changes or stops if the AC is on or off? Or if you turn your steering all the way to either side?

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Screeching noise from somewhere in belt pattern. Not idler, tensioner, power steering or belt. Does not run hot as if it were the water pump. It does get louder as the RPM's rise. I think it's the be

It doesnt have to be over heating if the water pump bearings are bad. I take wd-40 and spray one pulley at a time on the back side if possible to isolate the bad pully bearings. Start with your ac compressor first because next to the idler the ac pulley sqeals alot.

Jan 18, 2013 | Cars & Trucks

1 Answer

I was told its the waterpump that is making a load snorkeling noice what is its if not? almost like a dieseling noice also

Yes the water pump can make noises but there is also the belts that can make noises.
So pour some water when the car starts on the belt and pump area to see if the sound stops, if belt noise it will stop but if this is the water pump, the alternator bearing or the idler pulley , it must be checked.

Sep 29, 2010 | 1999 Ford Taurus

1 Answer

The fan clutch or belt to it, is making a screeching noise and then stops after a few minutes. We've tried everything to get it to stop. What lshould we do?

The bearings in the fan clutch, or idler pulley may be going out, which would create extra resistance. This would cause the belt to squeal until everything is moving like it should. Try to lube the bearings, and put some belt stop squeal spray on the belt ridges. If this doesn't help, take the belt off and find which pulley is causing the extra resistance.

Jul 13, 2010 | 1990 Nissan 300ZX

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How to locate and replace water pump on 2006 chevy trailblazer

The water pump is usually mounted center, Front of the engine and is run by a belt. Look for the location the water lines connect to that has a pulley attached.

Jul 11, 2010 | 2006 Chevrolet Trailblazer Ext

2 Answers

How do I change the water pump on a 2004 chevy trailblazer 4.2L?

dont change a water pump unless it is leaking from the pump itself. if your vehicle is overheating check the simple items first. a water pump very rarely goes bad.

Apr 12, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

97 Neon Expresso, Schreeching Fan

Both your air con and defogger (I am assuming you mean front windshield defroster setting, and not the back window) engage the air conditioner pump/compressor.

The screeching can be either a bad belt or a bad compressor.

How long has it been since the belt was changed? If it is old, and slipping, it will cause the screech at speed.
If the belt has recently been changed, and is adjusted properly, I would start looking that the air compressor pump.

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