[2002Z4CSS]

Originally Posted by rolling money pits

i'm leaning towards this as well.....stuck open T-stat.

how do you know the car is at normal temps? do you have a gauge?

same thing happened to one of mine a long time ago......barely any warmth from heater on full hot....stuck T-stat.

actually, it happened to my regular car couple years ago, only it had a gauge, and i could see it was low on temps with no heat coming from the vents.

If you don't have a temp gauge in the car, just looking at the coolant with the cap off and when you just start seeing a bit of steam vapor, it is getting warm. You could put a thermometer in the radiator neck to check the coolant temp. If you have a 195 degree thermostat and the vehicle is at normal operating temp, you won't be able to hold on to the upper radiator hose for very long. When a thermostat sticks open, you will see coolant flow in the radiator with a cold engine. Normally you will see flow as soon as the thermostat opens.