its been getting colder and i noticed my heat is not hot at all. I changed my coolant a few months ago and bled the air of the system(i think). i have since, added a 160 hypertech tstat and the programming. Today i drove home from work (15 miles) and figured id try to bleed the system again. i opened the screw and nothing came out. i let it go for about 5 min and nothing ever came out. I tryed this on an incline and flat and witht he heat on. What gives. I turned the car off and immediately opened the radiator cap. The radiator was full but there was No spillage or anything, this seems weird to me seeing that i drove 15 miles at 60 mph. Any ideas?

thanks

 

I have no heat and my problem is the heater core, you might try flushing that.

 

If you immediately opened the cap on the radiator and there was no pressure, maybe you have a bad cap or some other problem.

 

could i just be low on coolant? i am going to check the radiator in the morning when its cool and see if its low.

 

It should be full to the top when you check it cold. Still, there should be some pressure in the system after it is warmed up.