06 GP dont blow much heat

[AH06GrandPrix]

Base model car 2006 gp. the last few winters it does not blow much heat. I had the heater core replaced last March, when it went bad. I put a new 195 tstat in it this summer, no fix. If I reverse the hoses going to the heater core it blows more heat, then just after a couple days goes back to very little heat again.. I keep checking the coolant level, seems to be full.. I have bled the system from the top of the tstat housing. How do I check to see if the water pump is circulating properly? Any other ideas? Thanks

 

[Scottydoggs]

take both heater hoses off the alt bracket, put a garden hose to one of the hoses and flush it, leave both hose full of water put the hoses back on, re bled the engine of air.

that should fix it. as you flushing it, it it takes a while and you hear/see the hose burping, you had air for sure in the core.

 

[NegativeOne13]

Like Scotty said, more than likely air in the cooling system. Flush and bleed and should be set.