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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet K5 Blazer 4x4 (Full Size): Just replaced a water

Customer Question

Just replaced a water pump on my 1984 chevy blazer (305) and now temp gauge is pegged at max hot? Did the parts store sell me a reverse flow by mistake? Or maybe my thermostat is stuck? Possibly didn't get all the air out when refilling with coolant? Any help would be greatly appreciated as its my daily driver and I'm not comfortable driving without functioning gauges.
Submitted: 2 years ago.
Category: Chevy
Expert:  George H. replied 2 years ago.
Hello I will help you with your question,
The gauge is pegged from the time you turn the key on?
Customer: replied 2 years ago.
Yes, as soon as engine started turning over after replacing, the needle shot to max hot and stayed
Expert:  George H. replied 2 years ago.
OK, it sounds like the signal wire to the coolant temperature sensor was pinched so it is shorted or the sensor is shorted. If you unplug the sensor does the gauge go to full cold?
Customer: replied 2 years ago.
Haven't tried the sensor, but I'm pretty sure it wasn't disturbed during removal and install
Expert:  George H. replied 2 years ago.
OK, if the gauge is pegging at once then you know it is not the engine temperature as the engine is cold.
This is a circuit problem so unplug the gauge sender and see if it is now full cold.
Thank you
Customer: replied 2 years ago.
Will try that, thanks for the help. Much appreciated.
Expert:  George H. replied 2 years ago.
OK, let me know what you find and we can work from there