Blower motor issues
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Posting Guru
Joined: Mar 2010
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From: Northern MN
Blower motor issues
Alright, having issues with the blower motor, or the heater box, not sure which.
So when I have the heat on in my truck, on Vent, driving down the road it will occasionally switch over to Defrost on it's own. Then it will eventually switch back to Vent, and so on. Also what it is doing is now when I have the air turned OFF, it is blowing air on the Floor, and Defrost at the same time. Was wondering why it was staying warm in my truck with the air off!
So any ideas what is going on here?
So when I have the heat on in my truck, on Vent, driving down the road it will occasionally switch over to Defrost on it's own. Then it will eventually switch back to Vent, and so on. Also what it is doing is now when I have the air turned OFF, it is blowing air on the Floor, and Defrost at the same time. Was wondering why it was staying warm in my truck with the air off!
So any ideas what is going on here?
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
One of them vacuum lines (not the one in the picture but the one that goes to the vent selector valve from the engine intake manifold) has a check valve in it. If that valve is missing or the line's split/crumbling where it connects to the valve (and especially if you've also ditched the vacuum accumulator) then when you give it much more than half throttle you'll dump all the vacuum from the vent controls and end up in defrost.
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
How do you "ditched the vacuum accumulator"?
It is part of the heater/ac box.
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It is part of the heater/ac box.
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Unhook the vacuum line from the check valve in the photo below and use a hand vacuum pump and see if you can pump it to a vacuum.
Also check the vacuum hose going to the check valve at idle and see if there is vacuum on it.
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Also check the vacuum hose going to the check valve at idle and see if there is vacuum on it.
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Posting Guru
Joined: Mar 2010
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From: Northern MN
I don't have a hand vacuum pump, I suppose I could buy one.
I can check that, also how can I check the blend door? My dad said maybe that is just getting stuck or something.
I can check that, also how can I check the blend door? My dad said maybe that is just getting stuck or something.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
You can rent a hand vacuum pump at most auto parts stores and then get your money back when you bring it back.
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