When there is insufficient coolant, the temp would go up. 2 possibilities for the temp to show low.
1. Thermostat stuck in open position and while driving or with AC on, the engine is being over cooled.
2. Faulty gauge or sending unit.
Test with engine running and AC off with car stationary, if temp shows correctly after 20 mins, the it should be the thermostat.
Monday, October 27th, 2008 AT 4:23 AM