On my Mazda:
I flushed and filled the cooling system. I ran the car for a LONG time with the cap loose, then tightened the cap and ran it some more. I took it for a drive yesterday, and, figuring the temp was rising and the fan was kicking on while idling, everything was OK.
When the car is in motion, the temp guage barely moves above Cold. If I let it sit and idle, it builds up heat, but drops again as soon as the car starts moving.
I got a new thermostat, and installed it using the old thermostat, the instructions on the box and my Haynes for instructions. Refilled, let the car get good and HOT, sealed the system and went for a drive. Barely above Cold again!
I used Peak anti-freeze, a new gasket, Hi Temp gasket compound, etc, etc.
I believe the system is bled out...ran the car until warm, ran it up to about 2500 RiPpeMs for about 5 minutes, idle again till the fan cam on,
2500 RPMs again, then sealed the system and ran it until the fan came on.Other than sticking a piece of plastic or cardboard in front of the radiator, any other ideas?
BTW, the last time I ran the car, I left it idling for 5 minutes after a
10 minute drive, and anti-freeze was dripping out of the overflow bottle...