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Drove my 2001 2WD 2300cc short bed Ranger to the University today to pick up my bullet casting machine. As I pulled back into my driveway the heater control valve suffered a catastrophic failure. Lots of steam!
OK, Autozone had one. The wife just pulled in from work so she agreed to go pick up the part while I was taking the old one out. Cool! Got the old one out, put the new one in and replaced the gallon of coolant that had blown out, fired her up and checked for leaks. Everything looked good.
Got into the truck to shut off the motor and noticed that there was very little air coming out of the vents on the dash and that it wasn't hot. Hmmm, neither of those things are right. Turning the fan up or down doesn't make any noticeable difference except the the fan noise level changes.
Well, there is the vacuum line that plugs into the heater control valve. I plugged that into the new valve. That line controls the flow of coolant in the heater core. It doesn't have anything to do with the air flow through the system. There might not be any movement of coolant through the core but I need to figure out why there is so little air flowing through the system before I can really say.
A vac leak to the control head will cause the mode doors to not function properly resulting in improper air flow . There are a few vac lines in the area you were working .
Just checked it again after it sat over night. I took a piece of wire and poked it in through the cowl vents thinking that maybe there could be some blockage (lots of trees around here - they are always throwing off seeds and stuff) and then started it up. BIG DIFFERENCE! Now I have air flow that increases as you turn the fan up and decreases as you turn it down. Wish I knew a way to get into the heater ducts to clean out the 13 years of crap that has probably accumulated there. Anyone got any idea how to do that? Second thing is that she is throwing heat now and it responds to the **** that adjusts the heat. Could there have been an air bubble somewhere in the heater core that was blocking flow? That's the only thing I can think of.
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