A/C/Vents NOT working... - Page 2 - Ford Truck Enthusiasts Forums



1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

A/C/Vents NOT working...

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  #16  
Old 08-02-2014, 11:36 AM
Sean_Reno Sean_Reno is offline
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Originally Posted by ArdWrknTrk View Post
Sorry Sean, I'm not seeing your sig in the first posts of this thread.

CB, I would Rep you too, but I must like your posts too much!
There should be a vacuum motor at the recirc door on top of the heater plenum near the PS hood hinge.

But there must be a vacuum line going to either the reservoir or the distribution block (as is my case)
These plastic lines become very brittle and you might have broken it off without knowing Sean.
Yeah, I may have broken off some those plastic vac lines. My understating was I was eliminating all of that anyways w/the DSII swap...???
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Old 08-02-2014, 11:41 AM
ArdWrknTrk ArdWrknTrk is offline
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"all of that" = vacuum lines?

You can't eliminate the brake booster, distributor advance or climate controls...
(and EGR if you kept it)

Other vacuum lines control EEC, so there is that too (if you kept it)
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Old 08-02-2014, 11:43 AM
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here is a photo. The factory lines are small hard plastic lines (which get brittle over time). On my truck I had to replace these lines with rubber. Note how the two lines come out next to each other (at the top of the HVAC housing just under the hood hinge). The hose with the white dots feeds that vacuum control motor in the photo. the other line is manifold vacuum going to that check valve. From the check valve one line goes to my vacuum reservoir (ball shaped) tank and the other side goes to the intake manifold.

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Old 08-02-2014, 11:46 AM
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Dang, can't rep CB again. The diagram and pics are fantastic, and worthy of another + rep.......
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  #20  
Old 08-02-2014, 11:47 AM
Sean_Reno Sean_Reno is offline
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Quote:
Originally Posted by ArdWrknTrk View Post
"all of that" = vacuum lines?

You can't eliminate the brake booster, distributor advance or climate controls...
(and EGR if you kept it)

Other vacuum lines control EEC, so there is that too (if you kept it)
Right...I meant the plastic vac lines. And I of course added the new DS II Distributor and vac advance line. Apparently I disconnected the climate control stuff though.
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Old 08-02-2014, 12:34 PM
ArdWrknTrk ArdWrknTrk is offline
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My truck is a rats nest of those brittle plastic vacuum lines.
At least the colored ends are pretty easy to match up when you have to replace it all with rubber.

Not sure what vacuum controls you would have with EEC-IV that you would need to eliminate for a DSII conversion.
My truck was DSII from the factory.
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  #22  
Old 08-03-2014, 12:49 AM
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Quote:
Originally Posted by ArdWrknTrk View Post
I do think the three port plastic 'log' is present on all F/U series.
It's only on those with factory A/C.
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Old 08-03-2014, 01:18 AM
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Originally Posted by ctubutis View Post
It's only on those with factory A/C.
My non A/C 80 has it. Doesn't have anything hooked to it, though.
The truck does have dealer installed A/C, but it does not use any vacuum for the HVAC systems (yes, dual). The heat and A/C are completely separate units, sharing only the blower switch, which controls 2 different blowers.
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Old 08-03-2014, 04:45 AM
Sean_Reno Sean_Reno is offline
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Quote:
Originally Posted by ArdWrknTrk View Post
My truck is a rats nest of those brittle plastic vacuum lines.
At least the colored ends are pretty easy to match up when you have to replace it all with rubber.

Not sure what vacuum controls you would have with EEC-IV that you would need to eliminate for a DSII conversion.
My truck was DSII from the factory.
Most if not all of those plastic vac lines were broken off when I got the truck late last year. I cleaned all of them out when I did the DS II Swap.
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Old 08-03-2014, 04:48 AM
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PS as far as I know, I have factory air. Its currently working on the default defrost setting.
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