Question about Chevrolet TrailBlazer

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What is the normal operating temp when driveing normaly down the rod once the car is warmed up - i changed the radiator cap because it was over heating and the cap wasn't holding pressure - but my car is still running ruff it runs fine when at idel speed in park and the temp is low but when i drive it go's up to betwen 210 and 215- whenb i drive it it acts like it struggles to gain speed aspecilly up hill its sounds the the motor is over worken it's self i'v changed the fuel filter and spark plugs but still it lacks performance- it feels like it wants to bog out at certain speeds- i really neeed the right awnser to this problem polease -- i'v spent one hundred and thirty dollars tryen to figure out the problem

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Check at the back to see what coming out tell pipe. is ther water.could have crack or if ther is not of air pressure, maybe clog. it builds up back pressure which could cause stalls or to not start if is total clogged good luk, claymister

Posted on Dec 04, 2011

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About 210 degrees, but it depends on the thermastat you use. You may need to have the MASS airflow sensor check.

Posted on Jan 19, 2009

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I have no pressure in my radiator when the car is hot and running what is causing my problem


check oil make sure it dosent look like milk if it dose you have a blown head gasket if not it could be abad cap not holding pressure a leak, or a bad water pump good luck year and make model would help try scott on you tube.

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Not sure I follow your wording on the different temps. If the system is full of coolant and working correctly, the thermostat should open at 195 degrees which would be several miles down the road. Once the thermostat opens both radiator hoses should be warm. If the water pump is not working the engine will get hot very quickly.
Have you tried running without the thermostat to see what happens ?

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

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Overheating. Water pump appears to be good to go and thermostat was changed and the engine seems to be pushing the temp up when climbing a hill. I jumpered the fan relay switch so fan runs every time I...


The core pipes in your radiator may be blocked with particles of junk. There is no easy way to clear them other than to remove the top and bottom tanks of the radiator and push a rods through the individual pipes to push out the junk.
You could try back flushing the radiator, that is force the water back through the radiator the oposite way it normally goes with a high flow hose.

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1 Answer

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first i would purchase a new radiator cap 15 lbs 16 lb capacity cost about $7..then you must let car cool completely...now check radiator coolant level.. top off if it needs it. Now install new cap..let car warm up normally and after it get to normal temp range or higher put hand on upper radiator hose..it should feel hot and when you squeeze it you should feel a slight back pressure..this will mean that the thermostat and water pump are working correctly. if not either the thermostat you purchased is defective or your pump may not be working properly.
when you use just water in an engine the boiling point becomes 212 when you add the correct amount of antifreeze, depending on where you live, the boiling point will go up to 240 degrees. Make sure you put in the correct amount of mix.50/50 will usually work well. sometimes when a gauge does max out like that it could just be trapped air. if after you checked all this out and no air is trapped in the system, i would think that you may have a bad temp sensor. let me know if this helped thanks.

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1 Answer

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Replace the thermostat. If thermo is stuck open, coolant only heats up when there is no flow over radiator(idle) and then cools down when driving. Also, check coolant level, same response as stuck thermo.

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1 Answer

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Check the easy stuff 1st. Is the radiator cap ok (if equipped, some cars only have a cap on the coolant overflow bottle, no radiator cap). The rad cap can cause problems if it isn't sealing the system or relieving pressure. Next check the thermostat. If it is stuck open the car will take a long time to warm up, and then could overheat. Check out these 2 possibilities 1st, they are common easy fixes that won't break the bank. Let me know what u find and if u need more info. Good Luck!

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