No heat - need help

[Qsilver7]

Originally Posted by THE VEIN

...I'm driving for 15mins and the temp gauge could be half way and the car is still blowing out pure cold air ...

If your cluster is UNLOCKED...what coolant temp (KTMP) range do you see when you run TEST 7. TEST 7 is a better indicator than the "buffered" gauge which doesn't indicate the constant flux of the coolant's temperature

The 1st screen of TEST 7 allows you to monitor coolant temp (in Celsius)...you can do this while driving around town (I'm assuming that you have the high cluster since you still haven't created a signature so that we know the correct info to post)...if you have the low cluster, you can still get this info but the display & screens are slightly different due to it not having the 20 digit alpha/numeric display:

If your coolant temp is within normal operating range...then this would suggest that the issue may be the water valve/aux pump (aka heater valve) or the heating radiator.