Question about 2004 Chevrolet Impala

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Just replaced my thermostat on 2004 Impala. Temperature guage goes from cold to hot then goes back down. Heat seems to work when the temperature guage is lower but as soon as it goes up the heat turns cold.

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I going to assume you have the 3.4L or 3.8 L motor
these motors are notorious for trapping air in coolant system
which sounds like what your problem is
not a problem tho they have bleeder screw built into them
there should be one or two bleeders (depending on model year and motor size)
i think yours should have two
one should be on top of thermostat housing
other one right above water pump on bypass tube
open one bleeder at time with motor running until u see just water and no air
repeat with other bleeder
continue to work back and forth between the two bleeders until thermostat opens
then work back and forth a couple times after thermostat opens
keep checking radiator add coolant as needed

Posted on Dec 29, 2010

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I believe the mazda protege has a separate thermoswitch to activate the radiator's fan. Perhaps the fan keeps blowing until the temperature is too low. Try replacing the fan thermoswitch. Just take care to put in tis place a thermoswitch of the same temperature range.

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Sounds like a sticking/stuck thermostat.
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Your rad may be blocking up. Make sure the flow of antifreeze is adequate through the rad. Check for loose fins & debris in front of the rad also. Remove the rad cap when cold & allow to heat up to operating temperature. Observe the flow when the thermostat opens. Check the serpentine belt for wear & replace if needed. If the flow is inadequate, replace the rad. Good luck!

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If it still acts up, I would then replace the temperature sender.
Both of these parts are inexpensive and require little time to replace.
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