I have 1986 Monte Carlo SS. The level of coolant is constantly going down. I have performed a combustion block leak test and the fluid stayed blue during both tests…passing. I have ran a coolant pressure test and it has held the psi. The exhaust doesn't smell like coolant and I don't see coolant in the oil. The coolant will drop to the point where it is about 50% coolant in the radiator and 50% empty (it never goes below that point no matter how much I drive it…it normally doesn't take much idle/drive time to drop to 50%), yet the car doesn't overheat and the coolant never seems to drop below the 50% point. There is engine run on when shutting the car off (about 25% of the time when shutting the car off in drive) which maybe related?
Thursday, May 24th, 2012 AT 4:35 AM