Heat issues
#1
Junior Member
Thread Starter
Heat issues
The heat in my 2002 F-150 will only blow warm to slight hot air when driving or if it is revved up to around 1500+rpm. When I let off the accelerator or am stopped the heart goes to warm to almost cold. I have already checked the coolant level, and even burped/purged the air out of the coolant in hopes that would help. So far it has been 3 days since doing this and I am still having the same issue. Any ideas on what could be causing this and how can I go about getting it fixed without having to spend an arm and a leg on repairs? Thanks in advance for any and all advice/help. I forgot to mention that I have checked the blend door and it works properly.
Last edited by jscrawford; 11-13-2016 at 05:19 PM.
#2
Senior Member
Heater core could be plugged up and need back flushing. In my case the impellors on the water pump were eaten away and barely circulating the coolant.
#3
Senior Member
I have seen and heard of what JCR is referencing - impellers on the water pump can be worn enough that they don't move coolant much at all at lower RPM.