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97 TJ Heater Core Question

1144 Views 4 Replies 4 Participants Last post by  crallscars
I did a radiator flush but still only getting warm air when temps are cold (under 30). Engine temp normal 190-195. So I'm thinking of blowing out the heater core. Does anyone know which hose (top , bottom) into the fire wall is the in and out coolant flow? :beerme:
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The line that connects to the thermostat housing is the "in" flow to the heater core. The thermostat housing is near the front top of the engine. The other line connects to the water pump and is the "out" flow of the heater core.

Good luck on the flush, mine is plugging up as well and all I get is barely warm air on a cold day. Waiting until summer to pull the dash and replace the core. I've tried the plumbing flush about 5 times now and it only seems to work marginally.
 

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I ran water through both until it ran totally clear from both directions.
 
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