Temp. needle drops after turning off heater fan
My ranger has been sitting for awhile and I am getting it back on the road. I am having issues with the heat, but it seems to be coming back slowly. I have a weird problem. Heat comes out of the vents (lightly) when the fan is off, when I turn the fan on heat comes out for a little while then starts to turn cold. When I turn the fan off I noticed that the temperature gauge drops from the middle to just above "C". Then it slowly builds back up to half way again.
I have replaced the thermostat and the radiator (not because of this, just because it was rusted and leaking) and have new anti-freeze. The coolant level is correct and there are no air bubbles.
Anyone have an idea why this is happening?
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1998 Ranger 4x2 Sport package
3.0L Six cylinder w/5 speed manual transmission
317,000 miles
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