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My truck, 1995 F250 7.3 seems to be heating the air coming out of the vent with the temp selector on cold. Is there a heater valve control which goes out? Should I add a manual heat valve? Do I have a vacuum leak? My cruise control works fine.
You could have a vac leak. That does affect climate control, cruise, brakes, and tranny (if you got a C6). But I suspect if you had a faulty vac line to your heater vent valve, it would affect brakes and other important things. Probably the vent valve is faulty and doesn't turn anymore. I've seen a decent amount of these 80's trucks and vans have problems with that. Mine blows warm-to-hot air when I want it cool too. My solution to this, and making my AC a lot cooler, was to install a valve to the heater core to shut off the heater core circuit for the warmer months. Then I turn it on when it gets cooler. Something from McMaster Carr like this:
Nice, been meaning to investigate this for a while now. Seems unlikely that just heat off the firewall can heat the air coming out the vents that much. Its not like the heater is on by any means, but id say if it was 60* outside, the air in my vents is 70-75* I guess i ought to stick a pair of vice grips on the heater hose and see if / how much it changes things.
I have owned my truck a long time maybe 15 years. This problem has developed in the last couple of years. They make manual heater shut off valves. You screw um down for summer and not for winter. This problem always comes up in July and August in Texas. I need to fix my AC. I also noticed my AC was not getting as cold as before when it was working last year.
On mine, it is heat soak from the engine. When it is warm or hot out, sitting still or at very low speeds, heat will be felt from the vents, when the truck is moving normal cool air comes in. I turn on my A/C to cool it off when this happens, then after about a minute I turn the A/C off after the heat in the ducts is purged. The under hood temps can get quite hot, and with the heater plenum being a next door neighbor to the turbo and exhaust manifold, it is a likely issue. I will be adding some new insulation to the area at some point to try and combat this.
on the utility body truck in work it was a jammed blend door.
i pulled the heater core to access the inside of the heat/ac box and freed the door after removing 3 pencils and about $3 of change.
on the utility body truck in work it was a jammed blend door.
i pulled the heater core to access the inside of the heat/ac box and freed the door after removing 3 pencils and about $3 of change.
I wonder if this could be the reason my AC was not working well. The door is stuck on the heat side.
I guess I need to figure out how to get to the heater core. It doesn't sound like a fun job.
very well could be. on the service truck it was winter when i pulled it apart. the driver was crying he was freezing while snow plowing..
once i fixed the blend door he had to run with the window open because it was cooking him out of the cab.
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