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post #1 of 2 Old 09-23-2007, 11:55 AM Thread Starter
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Is my thermostat working?

My engine temp gauge only gets up right below the first tick mark and sometimes when I turn on the heater the engine temp will spike up and then drop back down. Every once in a while the engine temp will suddenly drop for 5-10 seconds or so before returning. Is my engine getting up to temp?
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post #2 of 2 Old 09-23-2007, 08:06 PM
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Did you do any work to the vehicle or did just start by itself?
First,factory gauges are not that accurate.
The only way you will truly know engine coolant temp is to connect a scan tool and read engine temp thru engine date.
Also some gauge fluctuation is normal, see the tsb below.
SUBJECT: 2.2L And 2.5L Temperature Gauge Fluctuation
DATE: Apr. 8, 1993
Some temperature gauge reading fluctuation on vehicles equipped with 2.2L or 2.5L engines during cold weather is NORMAL. This fluctuation does not indicate a cooling system problem, engine problem, or a malfunction of the temperature gauge.

The temperature gauge will rise until the thermostat opening temperature is met. When the thermostat opens, the gauge will drop to the lower portion of the normal operating range. This occurs because the thermostat has allowed the cold coolant from the radiator to enter the engine. The cold coolant is sensed by the temperature sending unit resulting in a lower temperature gauge reading.

This cycling or fluctuation of the temperature gauge indication will be observed until the entire cooling system temperature becomes normalized (obtains the same relative temperature). The colder the ambient temperature, the longer this condition will be exhibited. In extremely cold ambient temperatures the fluctuation may continue indefinitely

Any customer inquiries of temperature gauge indications above the normal range should be investigated as a potential over heating problem. (See Illustration)

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