I noticed tonight driving home in cold 18 degree weather after a while my car started to get nice and warm. However after almost being home I noticed that when I come to a stop and push the clutch in my temp guage indicator drops right to C (cold). Heat is coming out but the indicator jumps up and down almost along with the rpms. It raises back to the middle when I get on the gas.
Car is a 2001 Nissan Altima SE, manual trans,
60,000 miles on it. Kept in great condition.
Any suggestions or comments as to what it may be. I checked the coolant level and it is fine. Not frozen either.