AC Vacum problem
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New User
Joined: Jul 2013
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From: South of Houston
AC Vacum problem
this doesn't make any since to , what's going is, sometimes the AC starts blowing warm air, I found out if I goose it I can hear what sounds like the damper door slamming shut, then AC starts blowing cold again. I changed out electric vacuum pump, but it still does it, starting to get worse & its hot.
Truck is a 2002 f250 powerstroke, the way I understand it, is only thing vacuum pump is supposed to control is AC & 4 wheel locks, my truck is only 2wd. I don't understand why when when I goose it ,it goes to working, what can I do to fix this, any help will be appreciated THANKS
I just found out the " heat and cool "adjustment is electrical, not vacuum, it goes to something under dash, but I have no idea what it is, heat strip, reastat(sp)??? where and what damper am I hearing. It is not like heater is on ,not that hot, feels like ambient temp, im at a loss
Truck is a 2002 f250 powerstroke, the way I understand it, is only thing vacuum pump is supposed to control is AC & 4 wheel locks, my truck is only 2wd. I don't understand why when when I goose it ,it goes to working, what can I do to fix this, any help will be appreciated THANKS
I just found out the " heat and cool "adjustment is electrical, not vacuum, it goes to something under dash, but I have no idea what it is, heat strip, reastat(sp)??? where and what damper am I hearing. It is not like heater is on ,not that hot, feels like ambient temp, im at a loss
Post Fiend
Joined: Nov 2001
Posts: 6,748
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From: Tallassee, ALabama
sounds like a vacuum leak of some kind....maybe a bad blend door motor....or maybe some vacuum hose under hood have deteriorated from heat....or...with truck running, would get on passenger side and move controls and listen for possible leaks...
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New User
Joined: Jul 2013
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From: South of Houston
I had dash dropped and could see most all stuff, but still couldn't find leak . I even took off the vacuum reservoir and tested it. I cant locate any damper that would do this, I have moved all that I can see. I'm stumped. Thanks
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New User
Joined: Jul 2013
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From: South of Houston
Where exactly is the temp blend door & how do I get to it,
Thanks for the info, that's a start ,now to see if I can figure it out
Thanks for the info, that's a start ,now to see if I can figure it out
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
It's in the dash to the left of the glovebox. You either take the whole dash out to get to it or you cut a hole into the interior panels of the dash to get to it.
I'd suggest google searches of the part, you'll find many resources for information.
I'd suggest google searches of the part, you'll find many resources for information.
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Joined: Jul 2013
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From: South of Houston
Thanks for the replies , I think I will try and tear into today , again thanks ,I wouldn't have had any idea where to start without the help
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From: South of Houston
I thought I found & fixed problem ,but no. it didn't work, I took electrical box off what I think is blend door ( electric control box works) I put a piece of key way in door slot & ty wrapped it closed, I took cover off heater core,so I could see what I was doing, the key way fit good & would & close door. But it is still doing the same thing, Any ideas, I need help Thanks
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