BronsonA2150 Posted August 12 Share Posted August 12 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 August 12 Share Posted August 12 (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 August 12 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 August 12 Author Share Posted August 12 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 August 12 Share Posted August 12 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 August 12 Author Share Posted August 12 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...
BronsonA2150 Posted September 4 Author Share Posted September 4 Update if anyone cares to know. Found the valve/diverter whatever you want to call it while doing overhead. Stuck out like a sore thumb. Anyways I adjusted the clamp and it made a world of difference. I always like to set heater valves like a choke on a gasser so the lever isn’t quite all the way to the cool side before it fully closes. That way you know for sure it’s closed all the way. Kinda dumb, it appears they put it on the return side instead of the hot side. Would think hot side would be a better idea 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-582102 Share on other sites More sharing options...
Joey Mack Posted September 4 Share Posted September 4 You can put it either way, they still suck. Best way to control flow is a valve at the water pump and one on the rear water manifold instead of the nipple that's there. P.S. we care,, any solution posted is valuable 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75844-94-mack-heater-valve-location/#findComment-582105 Share on other sites More sharing options...
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