Question about 2004 Chevrolet TrailBlazer

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2004 Trailblazer 4200. R&R'd waterpump for leak. Now overheating. R&R'd thermostat and electronically controled viscous fan. Still overheating. Fan is PCM controlled.

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You may have an air pocket trapped in the cooling system.

Posted on Sep 25, 2010


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1 Answer

My honda cr-v 1999 is overheating how do I check the water pump is working?

the water pump will be working
what won't be working if fitted is
the viscous fan hub
radiator fans ,
coolant temperature sensor
fan relaypressure test the cooling system to check for cracked plastic tanks of the radiator
fan fuses
blocked radiator cores
head gasket
so if the fan is driven by a belt then replace the viscous fan hub
have a compression test done to check head gasket
have an auto electrician check the cooling system electronics and fans
have a specialist radiator shop do a flow test on the radiator and have an accredited service shop check the operation of the thermostat

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2007 500. Why is it overheating only when accelerating and going uphill?

have a compression test done to check head gasket and cracks in the head
if you have a viscous fan hub/ fan clutch ( not electric fans) replace it as it is slipping when it should be pulling air through the radiator

Oct 12, 2015 | Ford Cars & Trucks

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What makes a 04 envoy run hot and lose oil?

A hot running engine is usually caused by a cooling system problem. Make sure the coolant level is full and the thermostat.. rad fan.. radiator cap and water pump are all functioning correctly. Make sure there are no restrictions in front of the radiator to obstruct air flow and coolant circulates properly throughout the radiator. As for losing oil, check for the obvious..... Leaks. If no major leaks and you have a high mileage engine, suspect the oil to be burning within the engine. A constantly hot running engine can also cause the oil to break down quicker resulting in consumption, especially if oil changes are neglected

Aug 29, 2015 | Cars & Trucks

1 Answer

Changed out the thermostats and waterpump on my 05 lincoln ls v8 car is still running hot any suggestions

I hope you replace the thermostats with new units and put then in the right way round. (body of the unit in the water in the head). If it is overheating while at lights and you have a viscous fan hub then replace the hub. have a coolant pressure test done to check for leaks . Have a compression test done to check for head gasket or cracks. Ensure that you fill the radiator to the cap and run until all air is expelled from the coolant system

Aug 24, 2014 | Lincoln LS Cars & Trucks

1 Answer

Car was overheating replaced the thermostat now the heat isnt blowing hot and the car is over heating worse it's a mitsubishi galante

Could be that fan is not kicking on. check and make sure it is connected. could also be a vapor lock. some cars require bleeding water system and if so most bleeding screws are located around thermostat housing. Call local autozone and ask if your car requires bleeding water system....NOW the overheating could be from fan not kicking on and the best way to find out is to turn on defrost and if fan is working it will kick on automaticaly. If it does kick on then this shows that fan is working fine but this does not mean that fan is running properly.The fan is controlled by a heat sensor which kicks the fan on when motor reaches a curtain heat range. If this sensor is not working it will cause car to overheat.... Could be also that waterpump is bad.Not all waterpumps leak when they go bad.Sometimes the impeler on the waterpump which is what moves water through the system simply stops working and this would cuase it to overheat.......hope this info helps and good luck...Please rate my post and if you need more info fill free to contact me...Need to find where leak is coming from also for this is more than likely the problem........

Aug 15, 2012 | Cars & Trucks

1 Answer

Bmw overheating

do you have coolant leaking,how about along the radiator, or the waterpump? If your overheating and there is no coolant leaks. There is the cooling fan When the engine is cold the fan as it is allowed to slip,then when the engine warms up it viscousous fluid grabs and it spins faster, this allow for proper cooling at idle. To check the fan for proper operation at idle and at warm up temperature is the fan turning slow as you rev it up does it spin faster or does it look like it standing still, this will cause the car to run hot, here this now with the car at idle can you safetly feel the upper radiator hose and the lower is it at the same temperature if it not you water pump has failed, Because it ran hot the thermostat is now different in character and will no longer operate as it should and it will eventually fail,Now if you have a electrical fan does the fan come on when it is supposed to or does it come on at all.if it doesnt then it has failed, more than likely due to BMW way of doing things they still use the plastic waterpump propellor and they have a tendency to seperate internally and the radiator seam it cracks and coolant leaks out.

Apr 24, 2011 | 2000 BMW 3 Series

3 Answers

Engine keeps overheating

I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.

Feb 28, 2011 | 1998 Cadillac DeVille

1 Answer

Overheating and heater going hot to cold and cold to hot

Most likely a bad thermostat. Any leaks? Check your water pump for leaks and make sure fan belt that runs waterpump is tight and not Glazed

Jan 06, 2011 | 2004 Dodge Ram

1 Answer

My 2004 TrailBlazer overheats in running only I changed acdelco water pump , thermostat and coolant water and still overheat

check your fan clutch, very typical problem on these 4.2L engines. These fan clutches are electronically controlled. Another issue may be clogged radiator.

May 31, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Trailblazer lt 05 overheating

overheating has a few possibilities.
low volume from water pump.
air lock caused by a small leak
cooling fan not coming on. from radiator fan switch or relays.

have the system pressure tested,
check the fan operation,electric or clutch fan.

Feb 02, 2009 | 2005 Chevrolet Trailblazer Ext

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