Low coolant temp
Senior Member
Joined: Jul 2015
Posts: 705
From: Houston
Strange problem, the temp is too low! Could it be you have a extra large radiator, a high-flow or low-temp thermostat, and maybe someone put in a high-speed water pump and the water is going too fast to pick up all the heat from the engine.
Last edited by puttster; Jan 20, 2025 at 12:25 PM.
Thread Starter
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Beginning Member
Joined: Jan 2025
Posts: 12
The three thermostats I have open up around 195-205 in a pan , at this point these are the things I’m thinking:
1. The factory gauge is just off and not accurate ( I can try to wire up a aftermarket one)
2. The new radiator and new fan clutch are working to good. ( I can remove the fan and do a test run)
3. Some how water is getting around the thermostat ( I don’t know how to check for this the beveled o ring gasket Seem to seal good and makes a sandwich with the housing
it was 8 degrees this morning it stayed around 170 and the heat was Good
i might try to take the sensor out and put it in hot water of a know temperature to see what the gauge says
1. The factory gauge is just off and not accurate ( I can try to wire up a aftermarket one)
2. The new radiator and new fan clutch are working to good. ( I can remove the fan and do a test run)
3. Some how water is getting around the thermostat ( I don’t know how to check for this the beveled o ring gasket Seem to seal good and makes a sandwich with the housing
it was 8 degrees this morning it stayed around 170 and the heat was Good
i might try to take the sensor out and put it in hot water of a know temperature to see what the gauge says
BF Guru
Joined: Dec 2016
Posts: 5,610
From: Moscow, ID
The three thermostats I have open up around 195-205 in a pan , at this point these are the things I’m thinking:
1. The factory gauge is just off and not accurate ( I can try to wire up a aftermarket one)
2. The new radiator and new fan clutch are working to good. ( I can remove the fan and do a test run)
3. Some how water is getting around the thermostat ( I don’t know how to check for this the beveled o ring gasket Seem to seal good and makes a sandwich with the housing
it was 8 degrees this morning it stayed around 170 and the heat was Good
i might try to take the sensor out and put it in hot water of a know temperature to see what the gauge says
1. The factory gauge is just off and not accurate ( I can try to wire up a aftermarket one)
2. The new radiator and new fan clutch are working to good. ( I can remove the fan and do a test run)
3. Some how water is getting around the thermostat ( I don’t know how to check for this the beveled o ring gasket Seem to seal good and makes a sandwich with the housing
it was 8 degrees this morning it stayed around 170 and the heat was Good
i might try to take the sensor out and put it in hot water of a know temperature to see what the gauge says
If someone has the manuals for your year Blazer, they can look up the table of resistance vs. temperature of the OEM temp sensor. That would allow you to test the sensor, assuming it is not too hard to remove and replace. Perhaps you could measure it in place too. If the sensor passes, then it is the gauge in the instrument panel.
If you go with an aftermarket gauge and sensor, be sure to test it first on the stove top. Is there room to tap into the thermostat housing to install a sensor?