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Old November 12th, 2019, 19:30
SeanSS SeanSS is offline
NAXJA Forum User
Join Date: Jan 2015
Location: Indianapolis IN
Posts: 68
Another heat problem 'thread'

Yep, im gonna be that guy tonight..

Got a heat problem.

99 Classic

I flushed the cooling system 4x including the heater core 4x as well.

This insisted of draining the system the first time, adding some type of cleaner from valvoline, running/driving the jeep, draining that, filling with distilled water, running/driving some more, emptying the water, filling with water again... You get the idea.

So, i KNOW this isnt my heater core.. I have plenty of flow, both of my hoses get piping hot, i think i have a possible blend door issue.. However... Ive read and read and read and i have read a whole bunch of stuff about the blend doing being manually actuated via a cable directly from the HVAC controls on the dash, mine is not this way. I have the electric actuator..

Here's some more good info... I can visually see the actuator rotating and i can visually see that the white/yellow plastic piece coming out of the heater box is also rotating. I hear a sound difference in air movement when i switch my heat/cool knob to cool or to heat.. I can hear a difference, however... I am getting the most slightest of warm air through my vents.

Tonight, i tried to remove the electric actuator, i got 2 of the 3 screws out, didnt think i could get to the 3rd one, after giving up and putting it all back together, i read on website that a swivel is needed to get the 3rd screw out. So maybe i'll revisit that tomorrow as i do have plenty of tools including the swivel.

Whats next?

Is it really my heater core? Im nearly certain i have plenty of flow in that area.. Ive flushed and flushed and flushed the thing and water definitely flows into one hose and out the other. Is there something else i am missing?

Could the water pump have some play in this?

Is there a separate area where the water pump pushes coolant
strictly for the heater hoses? Im not familiar with exactly how the

water pump operates other then that it circulates coolant throughout

the engine.. Im not aware if pushes coolant specifically through the

heater hoses from the thermostat housing or what.

Help me out here.. Its cold, i have SOME heat, but man... I should have a whole bunch more..

Thank you!
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