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  1. juanprado

    m939 Heater Core

    contact info was accurate at the time I posted. They are crazy priced though. If you want OE, then just bring yours to a competent radiator shop to fix. Best bet in my opinion.
  2. juanprado

    m939 Heater Core

    For that much coin, a new one is just a little more.
  3. juanprado

    m939 Heater Core

    I have seen a full front/hood mask with headlight cut outs on some m939 GL pics from Alaska. They also have a M939 grill only roll up cold weather vinyl cover. Check wsucougarx build thread as he shows one installed.
  4. juanprado

    m939 Heater Core

    There is no fusible link. The power feeds 12 or 24 from the fan switch. I suspect either the switch or the motor is fried. See if you have power at either wire on the fan switch? There are some circuit breakers on the firewall bit I do not recall where the 24v comes from on the switch. the 12 is...
  5. juanprado

    m939 Heater Core

    Very true! I will also add that mine were steel. When I installed my coolant filters I changed the shut off valves because the handles were twisted off and the stems bent. What I found was that they were almost rotted through and very pitted at the hose barb. Definitely would have failed at some...
  6. juanprado

    m939 Heater Core

    I stuffed mine in tight with a dense sticky taped foam from Home Depot. I think it was for doors and windows but universal application. It was maybe 1 inch or slightly wider.
  7. juanprado

    m939 Heater Core

    Ronny, Welcome to ss! The blower motor is 12v on low and 24v on high. See the attached wiring diagram from the p2p software available here on ss at the top of the 5 ton forum in a "sticky". Also the newer 23 series manuals have excellent troubleshooting flow charts here on ss :-) The blower...
  8. juanprado

    m939 Heater Core

    Yup, same thing happened to me and after I wasted all that time, I figured I would help as many have helped me here by posting on ss. Patracy does have a deal on his though :-)
  9. juanprado

    m939 Heater Core

    Install went smooth and I burped the air out of it with the bleeder screw. I noticed after referencing the tm that my hoses were backwards. I had marked them when I took them off so they appear to have been mis installed at some point. The heater core inlet tube is the one closest to the...
  10. juanprado

    m939 Heater Core

    Yeah, it is crazy priced. Uncle pays $615 for the whole unit. Nice profit for a sheet metal box, heater core, bower motor & wheel, and the fresh air flap. Must be some crazy money in defense contracting.
  11. juanprado

    m939 Heater Core

    The heater is tagged original stock 12255989-1, Model HW 30-4 I have attached a product sheet on it. Hunter tech did reply to my email with contact information to their distributor that could help me with a heater core: Jim McMath of Windward Enterprises 843.897.3120 jmcmath@windwardent.com...
  12. juanprado

    m939 Heater Core

    I could not find a procedure in the tm for just the heater core removal just the whole heater box. It is not necessary to pull the whole box. Unbolt and move the heater control cable and bracket remove the 2 bolts holding the diagonal brace closest to the engine to the firewall remove the...
  13. juanprado

    m939 Heater Core

    We did get to 50 a few mornings ago considering avg temp seems to be 100 :-) I meant humidty also :-) year round. We all have to endure I know :-) Thanks for the lead. I will keep you in mind Drew but Jeff is also not too far from me and I suspect he still has some cabs if I do not come up...
  14. juanprado

    m939 Heater Core

    I will probably pull it tomorrow and play with it. I used to work parts for 20 years so I know my way around a buyer's guide and illustrated parts manual unlike the youngsters today at the stores who can only punch buttons. I will definitely share whatever I find. My interpretation of cold is...
  15. juanprado

    m939 Heater Core

    Sprung a leak today in my heater core during a parade in my m923. I see the heater core has a special vent fitting but I am wandering If anyone has picked up an aftermarket heater core that works in the m939 of the same dimensions and hose hook up orientation. I suspect it would be without...
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