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Temperature Gauge Fluctuation

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Old 04-12-2009, 06:49 PM   #1
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Join Date: May 2006
Vehicle: 1997 Mustang Coupe
Location: SouthWest
Posts: 60
Default Temperature Gauge Fluctuation

What could cause my temperature gauge to fluctuate between normal and hot if my my RPMs and speed are in sync? I've also noticed my heater will blow cold air at times. Thermostat, radiator?
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Old 04-13-2009, 08:47 AM   #2
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Join Date: Feb 2009
Vehicle: 1997, Ford, Mustang V6
Location: MA
Posts: 313

I would start with the thermostat, could be the cause of the problems you listed.
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Old 04-14-2009, 01:18 PM   #3
Join Date: Jul 2008
Vehicle: 2001, Ford, Mustang
Location: New Mexico
Posts: 27

having the same problem, tried bleeding the cooling system worked for awhile but now car oveheats and heater blows cold air. wonder if i need a new radiator
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Old 04-14-2009, 01:27 PM   #4
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Vehicle: 1997, Ford, Mustang V6
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Posts: 313

Have you replaced the Thermostat?

Radiator failures are rare unless you punctured it or something similar.
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Old 04-14-2009, 01:27 PM
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1994, 1995, 2004, 39, bleeding, fluctuates, ford, gauge, gt, guage, mustang, replacementand, temperature, thermostat, v6

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