Another Crazy Temp Gauge
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New User
Joined: Mar 2003
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Another Crazy Temp Gauge
Installed a new water pump and thermostat on my '94 Explorer 4.0 today. Now, I am experiencing rapid fluctuation in temperature from the 'N' to 'R' in normal - from one minute to the next. This is city driving, haven't had her on the highway yet.
With my old setup (original water pump and thermostat), temperature would move very slowly between 'N' and 'R' with obvious engine strain / release, but usually sat like a rock on 'O'.
Everything was installed correctly, the thermostat is opening, etc... anyone have ideas? Here are some of my guesses:
1) New water pump is not working 100%
2) Thermostat (supposedly high quality, 195 degrees) opens and closes quicker than my old OEM one, causing more variation - maybe my old thermostat was stuck partway open?
3) Air in the system (?)
Thanks for your input.
With my old setup (original water pump and thermostat), temperature would move very slowly between 'N' and 'R' with obvious engine strain / release, but usually sat like a rock on 'O'.
Everything was installed correctly, the thermostat is opening, etc... anyone have ideas? Here are some of my guesses:
1) New water pump is not working 100%
2) Thermostat (supposedly high quality, 195 degrees) opens and closes quicker than my old OEM one, causing more variation - maybe my old thermostat was stuck partway open?
3) Air in the system (?)
Thanks for your input.
Thread Starter
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New User
Joined: Mar 2003
Posts: 16
Likes: 0
Another Crazy Temp Gauge
Thanks, Dan.
I flushed and burbed the system really well (found some air sitting in the top of my upper rad hose) and made sure the fan clutch was on tight. Running like a rock (for) now.
I flushed and burbed the system really well (found some air sitting in the top of my upper rad hose) and made sure the fan clutch was on tight. Running like a rock (for) now.
