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I am building a 84 f150 4x4. I changed out the dash to a 88. Using the 88 heater box so the dash fits correctly, does anyone know where I need to hook up the main vacuum feed at? From what I can tell there is a empty box on the side of the heater box on the firewall side. Would this be like a vacuum canister or reservoir per say to hook up the main hookup. It is a heat only truck if that matters.
If you don't have A/C then why do you need vacuum to the heater box? Did they make those heat-only controls vacuum-operated in the later years? They're cable-operated 1980-86.
In any event, I suppose you'd want to hook it up to manifold vacuum.
No idea what box you're referring to (pictures would help) but you want a vacuum reservoir to keep the vents from falling to defrost mode during periods of low engine vacuum.
Yeah the box I pulled out was heat only. From what I can tell it uses vacuum to move blend doors from floor and defrost as well as dash height. I will take a picture tomorrow and post of what the little box looks like.
OK here is a picture of the heater control and the firewall side of the heater box. I put a piece of blue painters tape on what I was call the reservoir or canister to hook vacuum up to. On my box there are 2 vacuum actuators inside and 1 outside.
Yeah, your heater controls are definitely different than mine.
Strangely, my non AC truck uses an AC heater core, but there is absolutely no provision for an evaporator coil.
I think perhaps there was a lot of weird things happening in 1987, as Ford transitioned to the new body & interior.
Yep, got new heater core today and it takes a core for a AC truck as well but mine is heat only too. Just need to figure out what vacuum I need. Would anyone have a vacuum diagram?
I talked to a guy at the local Ford dealership today. He is in parts now but was their electrical and vacuum guy out in the shop a while ago. He said I should try once going to hook manifold vacuum to that small reservoir with a check valve in between it and the manifold. Set a Tee there at the reservoir and hit the one tube that runs inside. He thinks there might be enough vacuum reserve in the small box to keep the blend doors in the correct location when my manifold vacuum drops. If not then might just have to add a small canister for more vacuum storage. So hopefully this will work out.The truck wont be a daily driver with a 418 stroked clevor motor in it, but it still will be nice to have heat and defrost during the winter. He tried to locate the EVTM for me but he said a lot of the truck books walked off out of storage. So ArdWrknTrk if you do run into your copy I sure would appreciate it.
I know right where my '87 manual is, but it is sleeting sideways right now.
The only one on Ebay presently is no great deal, but it is there.
http://www.ebay.com/itm/1988-FORD-F150-F250-F350-SUPER-DUTY-TRUCK-ELECTRICAL-VACUUM-TROUBLESHOOTING-EVTM-/161583929675?hash=item259f27194b&vxp=mtr
If I dig my way out there tomorrow I will snap some pic's of the heater control pages.
Off to plow tonight. (at least it's not my truck)
I did take pictures today, of both my heater controls and the pertinent pages of my 1987 EVTM.
Unfortunately my phone isn't syncing with Dropbox or G+ even though I'm now on wifi.
And I am unsure how to upload photos in a mobile window directly from my aging Android phone. (just too old and out of touch, I guess)
I will edit pix into this post when I get it sorted, but I really think you need a 1988/89/90 EVTM to explain your vacuum controls.
Sorry I can't be of more help.
No problem. Thanks for trying to help. I will try what the guy from Ford told me when I get it running. If it doesn't work I will keep trying till it does. I do have a small vacuum pump I can maybe dry run it to try it out. Thanks for the replies.
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