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heater help!

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have you done any bumper mods in the front?if so the vacuum canister there is the heater control canister just like the vacuum operated 4x4


Meaning did you cause a vacuum leak that affects heater door operation?


I also have heater issues (low output temp).


Today I'm going to flush the cooling system and try to back flush the heater core.


Did this last weekend to the GFs XJ, it helped but still wasn't what was expected in terms of heater output.


Outside temps were around 0* so I kind of have to take that in to account, my best guess is clogged heater


cores on my MJ and the GFs XJ.

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