No Heat, Replaced Heater Core and T-stat
Ok so I've had this problem for a while.
At first I had no heat and the gauge would drop to cold until I switch the A/C **** to OFF (closing off heater core) and then get the engine to rev. Upper radiator hose gets hot.
The inlet hose to the heater core got pretty warm (not as much as I would think it should be). So I tried back flushing the heater core.......nothing.
Back in December I took out the thermostat and replaced the housing. Then I flushed the system using the Prestone Flush N Fill kit. Then drained. Then added the Prestone Flush mix. Ran the engine for a while. Drained it. Then replaced the thermostat with a new Motorcraft thermostat (I think it was rated 192). Nothing.
Then I replaced the heater core. Got a little heat but still it would drop in temp and on the gauge until i switched the **** to off.
Each time I've tried to get all the air out of the lines. Even filled to the top at the heater hoses using the Flush kit port.
I don't know what is going on here. Could my water pump be getting weak where it cant produce enough power to flow fluid to through the heater core? Or is my thermostat too low of a rating (its only 3 degrees less than stock).
When I flushed the system it contained a lot of sediments and rust particles. Could this be parts of my water pumps impellers?
Quality Engineer (Electronics) for Kia Motors
University of Tennessee Electrical Engineering Graduate
2000 XLT 2.5L A/T