Ok guys I had a 160 in before and now that its winter I changed back to a 195 so I would have hot heat but my car will barely get over 100 going down the road I dont know why it worked fine when I first put it in a few days ago but ever since then it wont heat up so I have no heat and the lady doesnt enjoy it nor do I lol. So any help would be appreciated on what it could possibly be. I went with a failsafe thermostat by the way. I also know its not the temp sensor because my heat isnt hot at all.

 

pull the tstat and see if its stuck open. if it is check to make sure the heater bypass valve is allowing hot coolant into the heater core.

 

Those failsafe t stats are troublesome, if you got the engine hot while trying to get the air out of the system then it probably in the safe mode(always open).

 

So Ive heard and it actually got pretty hot the other day when I got stuck at a wreck and my fan doesnt work so that is probably it but picked up a new duralast one today about to slap that in the car now.