still driving the buddies 99 regal GSE

what would cause the vents to blow cold, hot, cold, hot, ... intervals about every 5 minutes...

ECC is not being touched during this time, always set at 90*F, full fan, and it does it on defrost, vent, or floor heat...

Have you checked the coolant level?

OH MY GOD

not a drop visible...

the engine as not been overheating at all.. running just right at 200*F, so i didnt even think to check the coolant... must be just cold enough... ill throw some more coolant in it and see what happens

In the radiator

none...

I do not see how it does not overheat when you said you have to let it sit for 20 minutes for the steering to work

Must be cold in MN

i have drove it continuously for over 90 minutes already and it has not overheated... its was -10*F today