I have a 1992 GMC Suburban. It had a small coolant leak in the Radiator. I replaced the radiator with the exact same one that was in it. I replaced the upper and lower radiator hoses and the thermostat (195 degrees) The normal operating temp used to be almost 210 on the temp gauge I'm guessing that it was most likely 195-200 degrees Now It seems over cooled as it never reaches the 195-200 mark and cools all the way down to 100 degrees it is much worse on very cold days. I have 85% of the radiator blocked off with cardboard and still no success. Heat will be warm for a few minuets and then go cold then warm again. I live in South Dakota where the temps get VERY cold -30 to - 40 in the winter but this has never been a problem before with this suburban or any of my other trucks. rear hat almost never worked either. I just cant seem to get it warm and keep it there. seems way over cooled
You may have been given the wrong thermostat. Either way, you can try a hotter thermostat. If the water pump has never been changed it might be time for a new one. I've already had one that was so old that the propeller inside had the fins rusted completely off and the bearings were so bad it was messing up the timing of the motor. The truck wouldn't idle. And guess where alll the rusted off propeller chunks ended up. . . that's right. In the radiator, heater core and the thermostat. I flushed that truck for three days in both directions to get all that scrap out of there. Good Luck. And if you still have the old thermostat you can always throw that one back in, just to see what happens.
I forgot to mention to those trucks have a ecu coolant temperature sensor that threads into the engine block and a quick connect coolant sensor plug that goes into them. What that means is your aren't getting your answers directly from the sensor like on the old mechanical gauges. It has to go through the cpu before it gets to you inside the truck.
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Check your heater hoses and make sure they are getting hot when the vehicle is at operating temperature.You could have a partially plugged heater core.I know this does not have anything to do with the temp gauge but this could be the problem with the heater not heating very good.Also if you can put a scan tool on the vehicle to monitor what the engine temp actually is running at.This will tell you if the gauge is not accurate.One other thing is check and make sure the clutch fan is not staying on all the time.I am in Wisconsin and we get similar weather.Hope this helps.Good luck.
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