Question about 1997 Chevrolet K1500

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Engine overheating I just swapped out my old 350 vortec for a remanufactured motor. Got it running correctly, but the temperature gauge will not hole around 200. it will climb all the way to 260 if i let it. Thought it might be a thermostate prolem, so i put a new one in. Still doing the same thing. Water pump has no leaks and coolant is getting to the thermostate and into the intake. I am stumped! ahh

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  • jgrysen2k3 May 16, 2009

    water is moving.....it takes about 5-10 minutes at idle to overheat...radiator cap is off

  • Richard Scordino May 11, 2010

    make sure clutch on fan is locking up when it gets hot...otherwise, either have radiator boiled out or replace it.

  • Jerry Koski
    Jerry Koski May 11, 2010

    have you tried to have your radiator flow tested ? sounds like it is starting to plug up.. could be with the new engine flowing better pushed a bunch of **** around in the radiator plugging it more.. just an idea ..

  • Rick Amick
    Rick Amick May 11, 2010

    Can you see the water circulating in the radiator?

  • d_dpeace May 11, 2010

    how long does it run til temp gets hot?is radiator cap on/off? is water moving ?

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Have the thermostat pressure tested at a parts store like auto zone or schucks if it's bad replace it. also buy a infa red heat temp gun about $30.00 use it to check the catalytic converter to see if its working, put a vacuum Gage on the intake and see if you have 18 HG in of vacuum if not your exhaust is plugged, also did you put the thermostat in right? also try a new thermostat I have had as many as three bad ones in a row, so buy a stant high performance thermostat to replace it with also what was wrong with the old engine? did it overheat to? also check that there are no bugs covering the ac condenser not allowing it to not cool, and dose it have a transmisson cooler in the radiator or do you have one mounted on the outside, if it's in the radiator you may have a transmission problem causing the problem, there are many more things to check but the infrared test gun will help you pinpoint the problem better than me just guessing without more detailed information. A bad cap will cause the water to boil if it is not pressureized and if there is no antifreeze it will boil also. and it is way to hot you may have air buble in the engine or a blocked raditor hose two, the other guys were correct to so I am not posting there suggestions again.

Posted on May 28, 2009

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