1994 mx3 1.6l 5-speed low-no heat

[pdoan_98]

I replaced the timing belt, water pump, and thermostat. When the car idles I can get the temp gauge to go up and I get heat. When I drive, the temp gague drops below the "C" and I lose my heat. I have checked the fluid in both the radiator (which was low and I bled the air bubbles out, I think) and the fluid in the resovoir tank. I have added fluid to both when needed. Any ideas??

[crazycanadian]

Sound like you still have air in the system..

[pdoan_98]

Do I keep adding fluid in the system? How will I know if and when the air has vacated the system?

[Nd4SpdSe]

Air in the system would cause it to overheat, air is less efficient for cooling that water

It sounds like it's being overcooled, especially when rolling, your pushing air across the rad. I'm still going to suspect the thermostat, either defective or stuck open for a reason or another. Don't get the "fail-safe" thermostats, they're known to be unreliable.

[pdoan_98]

Would a bad rad cap be a possibility?

[pdoan_98]

What temp range should the stat be rated for?