Question about 2003 Chevrolet Malibu
When i first noticing that it was overheating I should check water pump, it was ok but i just replaced it.. then I checked the temperature sensor and thermostat i replaced both, then was still overheating then I checked all the gaskets for leaks, but no leaks.. then i checked the radiator it was okay so bought a new one.. was still overheating... so then i checked the spark plugs for water.. i cranked the motor, then water spitted out hole where the spark plug goes..so figured it was the head gasket.. I dont know why this car keeps blowing gaskets ive changed it three times.. and rebuild short block once,and rebuilt the heads three times?
It could be a cracked head ( no mention of any head work done such as checking for cracks) , or having it machine flat or checking for cracked cylinder liners
another problem with DIY mechanics is that they do not clean out the head stud holes so the tension applied is stopped in the hole and not applied to the head and gasket
They do not used new studs , do not tension in a rotation and use varying torque settings to get the head tightened down evenly
the reason for the head gasket problems is the mechanic doing the job and not following the workshop procedure exactly
Posted on Apr 08, 2017
You need to strip the engine down and check the top of the block (deck) for cracks and have it resurfaced, Do the same for the cylinder heads, check them for vcracks and have them resurfaced. Use felpro gaskets.
Posted on Apr 08, 2017
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Posted on Jan 02, 2017
Culprit is probably the temperature sensor located about 2" above the thermostat. Also, keep this in the back of your mind......The little tiny stepper motors on the back of the guages tend to go out in Trailblazers and Envoys. They're cheap and easy to replace if this ends up being the problem. The thermostat sensor is about $35, but you have to drain the radiator again. The bad thing about this is, it will be the same amount of labor as replacing the thermostat. So expect about the same amount of money to have someone do this as the thermostat. The alternator needs to be taken off just to get to it, which isn't easy.
Posted on Jun 09, 2011
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