Temperature Gauge - Fluctuation Explanation
NO.: 08-15-93GROUP: Electrical
DATE: Apr. 8, 1993
SUBJECT:
2.2L And 2.5L Temperature Gauge Fluctuation
MODELS:
1989-1993 (AA) Spirit/Acclaim/LeBaron Sedan
(AC) Dynasty
(AG) Daytona
(AJ) LeBaron Coupe/LeBaron Convertible
(AP) Shadow/Shadow Convertible/Sundance
(AS) Caravan/Caravan CV/Voyager
DISCUSSION:
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 (refer to illustration).
POLICY: Information Only
P-1039