M-1026 heater issue... is everyone else freezing to death?

[Kane]

We used our M-1026 last night for the first time running a rolling road block so the State could clear 10 miles of 12' snow drifts. The air temp last night was -12 with a windchill of -35. The truck ran perfect all night, but the temperature of the cabin heater was probably 40 degrees. It was bearable when sitting still, but when driving, it was easily dropping to 20 degrees or colder inside. During the entire 6 hours I was in it, I never stopped seeing my breath.

Is this what I should expect? I plan to take a closer look at the heater core and heater valve next time I'm at our station.

Thanks in advance for your input.

Kane

 

[Retiredwarhorses]

I guess the question is, did you feel any warm air coming Out? If you have never raplaced your heater valve I would start there.

 

[Retiredwarhorses]

Oh, also check your vent tubing....unfortunately,the one that feeds your side of the truck in the drivers area is under the dash and runs from the pass side...

 

[Kane]

Oh, also check your vent tubing....unfortunately,the one that feeds your side of the truck in the drivers area is under the dash and runs from the pass side...

We got the truck in late summer, and until last night has been under construction. This was its first time out. Do the heaters usually perform better then that? I'll check the tubing and the heat valve is the thing I want to look at first.

 

[vitamink]

I drove my 1025 in sub zero temperatures and I couldn't be colder. The vents themselves felt Luke warm. The air leaving the vents was Luke warm for about an inch but was ice cold by the time it hit my face.

 

[BKubu]

Find a fuel burning heater kit. You will be noticeably warmer.

 

[gcbennet]

I was having the same problem. What i did was pull the heater core and rigged a hose onto the inlet and outlet tubes and blasted hi pressure hot water through it, alternating from both ends into my wash tub. I also filled it with CLR and even some dishwasher powder a few times for good measure. After letting it sit for a bit with the chemicals i continued to blast hot water through it, and did some shaking and banging until the water coming out was clear and the same pressure as going in. All sorts of brown crud came out- little bits at first then big chunks. When i was satisfied it was as clear inside as i was going to get it i slapped it back in the truck and it now blows hot air again like it should.

 

[BKubu]

Huh?!? Stop messing around with the standard heater kits. With my (gas) fuel burning heater in my M151A2 with a soft top, I can run around at any temperature and I am toasty, almost uncomfortably so. In my M925A2, I either have to shut the heat down every little while (no matter the temperature) or crack the windows just so I am not burning up. I was driving one time and I realized my foot felt like it was on fire. Well, the tip of my shoe was right under the duct and was "cooking" my toe. M1075 has at least one for sale. It is for a 5 ton (with some simple mods) or a deuce, but it could be modified for a HMMWV. Heating a HMMWV would be cake; getting it to defrost the windows would be tougher because you'd have to fabricate quite a bit to get it to work. I have like 5 kits and I am keeping every one of them. They are invaluable to me.

 

[murryinmcminnvilletn]

I have a m1028 /m1010 wiring ok had the same problam it was my thermostat check it start it turn the heater on let sit for 20-30 mins heat on high go out and see if it hot in side of cab if so go get a thermostat hope this helped

 

[Hell On Wheels]

HMMWV's are know to have good heaters so if you have either a restriction or a bad core. I have been stationed in Germany and Korea and the heaters work good enough. It also depends if its a hardtop or soft top.

 

[Kane]

Its a hardtop, slant back. Thanks for all the tips. I'm going to look into the core and valve first.

 

[Southerneze]

Had the same problem, stopped up core was the culprit.

 

[vitamink]

How do you unclog a core? ...and explain it to me as you would to a 4 year old

 

[Southerneze]

How do you unclog a core? ...and explain it to me as you would to a 4 year old

Gcbennet did it the right way, I was lazy, took the inlet and outlet loose, clamped a water hose to the inlet and let it run till it was clear. It started out as a trickle , the sludge chunks that came out were almost as big as the core tube. Also I am running a four man soft top, I left the two man rear flap in which I lower in the winter if no one is in the back. Much easier to stay warm with the smaller area to heat.
Gary

 

[MASIC]

Save yourself a ton of trouble and install a coolant filter between the engine and heater core. I have never had a problem but I do need to rinse the pre cleaner mesh filter 3 to 4 times a year.