Heater still not getting hot
I posted a thread a while back about this, and yesterday finally tried to fix the problem.
Problem: Even after driving 10-20 miles heater is only mildly warm.
Attempt to fix was, replace thermostat, flush out heater core and radiator. I drained the radiator. took 1 of the heater core hoses loose, and attached a garden hose to it. Started the truck and ran water thru the system with the engine running and the thermostat removed. Then swapped the garden hose to the expansion tank for a while. Did this back and forth until clean water ran out of ever possible opening I could open and still run the engine.
Then I put in some prestone coolant flush. Let it idle a while, drove it a few miles. Came back drained radiator again and flushed with clean water some more.
Refilled system with new coolant/antifreeze and water mixture, after reinstalling a new thermostat. I then let it idle a while to warm and mix the new coolant. Turn on the heater and its blowing good hot air. Park the truck.
Got in the truck a little later last night, drove it for a little bit and the heater never got hot. But the heater hoses are hot to the touch, but not sure if hot enough to heat the cabin. The system is full of coolant.
Anyone have any clues?