HOW DO YOU REMOVE A WATER PUMP FROM A 2006 CHEVY TRAILBLAZER WITH A 4.2 ENGINE

Ull need to scanit w a factorytool at a privateshop. It reads a datastream to pinpoint issues. Those portabl readers are general. Dont just replaceparts n hope. Oldercars can hav worn wireharness causin weird problms too. Unplug computer n cleanpins..dirt is common in aging vehicles creating issues. Since its jyst an emmission thing udont need to worry its runnin too lean or sumthin crucial

Could be the water pump leaking.

If the noise changes with engine rpm, possible bearing from one of the drive accessories. Idler pulley..tensioner pulley.. alternator bearing.. ac compressor bearing.. water pump bearing etc. If you remove the belt and spin all the pulleys by hand, usually a defective one will be heard/felt

Check your water pump.Here's a link on how to replace.

it can be most anything on # 4 cylinder. plugs, wires, coil, etc. good-day !

1 hour if have done them before.If not 3 hours should do it.however you need a special tool to take off the fan clutch from the pump.Caution should be used as not to damage the radiator as it is a tight fit.

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.

The only trick I recommend is getting the Haynes repair manual on the vehicle and following the direction in there to do the job. As far as parts are concerned one is pretty much the same as the other.

Check your coolant level, low coolant or air in your cooling system will make a "thud"noise in your heater core when the engine is under load from acceleration. The coolant rushes in to the heater core where the air pocket is trapped and then your hear the noise.
Start with the simple and make sure your coolant level is correct and then try to purge the system to remove the air out for your coolant system.
Thank you for using fixya and good luck

lol i just did this its a lot of work but if you want to do it you have to drain the fluids then remove the radiator and the fans then then undo the sur. belt after that you have to use a 3 way puller (inside puller) after that you take off the block cover then mark the timing belt on all 3 gears ( very criticale that the belt gets back in same spot so mark the noch of the belt and the noch of the gear both if not done right you could send a piston rod thrue your block the your car is dead) loosen the timing belt and the remove the 3 bolt to the water pump in the top middle the put the new one in and put everything back together have any ? let me know on [email protected]