BronsonA2150 Posted 7 hours ago Share Posted 7 hours ago Where is the valve located that the dash valve adjusts for temp control? I believe mine needs adjusted as I have to close the valve on top of the engine for a/c to work so I’m pretty sure dash valve isn’t closing all the way Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/ Share on other sites More sharing options...
Joey Mack Posted 7 hours ago Share Posted 7 hours ago (edited) No dash valve, just diverter flaps. We would put a shut off valve on the manifold where the heater line hooks up, and on the top left of the water pump where the nipple is.. Close them in the summer, and open them in the winter.. the inline cable operated valve is junk, but good enough for when outside temps are average for the time of year.. Edited 7 hours ago by Joey Mack Pour sell fone sperring 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-580557 Share on other sites More sharing options...
BronsonA2150 Posted 7 hours ago Author Share Posted 7 hours ago 1 minute ago, Joey Mack said: No dash valve, just diverter flaps. We would out a shut off valve on the manifold where the heater line hooks up, and on the top left of the water pump where the plug is.. Close them in the summer, and open them in the winter.. the inline cable operated valve is junk, but good enough for when outside temps are average for the time of year.. don’t have anyone here to help me right now but pretty sure this is the valve I’m looking for on the outside of the firewall isn’t it? Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-580558 Share on other sites More sharing options...
Joey Mack Posted 7 hours ago Share Posted 7 hours ago Thats the A/C expansion valve.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-580560 Share on other sites More sharing options...
BronsonA2150 Posted 7 hours ago Author Share Posted 7 hours ago 4 minutes ago, Joey Mack said: Thats the A/C expansion valve.. Yep guess I just noticed that after looking again Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-580562 Share on other sites More sharing options...
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