My Heater Is Not Blowin Hot????????

[str8sixblazer]

the blower works great,i got a 180 brand new thermostat, the hoses are hooked up, and the heater core aint leaking? any info is appreciated thanks

[Huck]

Couple of issues to check---is the hose to the heater core getting hot indicating flow? 2nd--the heater control flapper needs to open to allow air to pass through the heater and into the cab. Depending on if the truck is an AC or Non-AC---trace the cables to see if they are hooked up or broken---start to disassemble the in cab heater ducts to find the air flow blockage. It can and often is a Mickey Mouse House nest in the plastic heater housing which can be a PITA to clean out but must be done if it's blocking air flow.

[68gmsee]

Also, could be the heater control valve. The lever is in the heat mode, but the valve is not opening allowing hot water to run through the heater core.

[str8sixblazer]

thanks for all the help. but where would the hearter control valve be?

[Spray-Bomb]

Also you could have a bunch of leaves or something in your cowl & heater box blocking air flow

And you may have a heater core that is corroded up inside, but check all the other stuff before you replace the core

[caminokid]

Or could be like me....pinched hose to the heater core.

[Camper Power]

try checking your coolant level, if it gets too low the heater won't work. this happened to me once