Vacuum Controlled Heater Core Valve

[Gary Lewis]

Gary, I have not had a chance to read through the links yet, but just very quickly I will say that the new style controller needs the new style cable. It has a squeeze lock end that pushes into a hole on the white plastic leg on the back of the controller, and the cable tip is a dog-leg that goes through the little hole on the metal lever. I will try to get pictures of this if I still can on mine.

Also, from what I see, the old style vacuum switch and square connector was 1989-1982. The flat connector and new style switch happened in 1983 when the face design changed.

Jonathan - That would explain a lot on the cable.

As for the flat connector, did you mean 1979 to 1982? So, it changed in '83? Hmmm, I missed that.

Thanks!

[Ford F834]

Jonathan - That would explain a lot on the cable.

As for the flat connector, did you mean 1979 to 1982? So, it changed in '83? Hmmm, I missed that.

Thanks!

Sorry, I was in a hurry and I fat-thumbed the date on my phone. Should have just been 1980-1982 had the early controller style...

[Ford F834]

Note that I edited the referenced post as the indicated valve will not work. It opens with vacuum instead of closing.

Gary, I am perhaps getting a little confused... is there a valve that closes with vacuum that will work using the early controller port #1? I get that the pictured valve functions opposite, but is the idea still valid with the right valve?

As far as the web page write up, I can confirm that the HVAC controller swap is possible if you have the cable, vacuum harness, and function switch connector that match the HVAC controller, and the illumination pigtail that matches the truck harness. The things I still have questions are:

-1983 specific cable (I don't know what this difference could be, I've just seen the two types and 1983 has the "late" style switch. I see no difference between 1983/84/85/86.

-Non AC trucks... I have not looked at the controllers or cables to see if there are any different issues to watch out for. My guess is that the same changes were made (function switch plug, vacuum harness, and cable type) but I have not verified this.

[Gary Lewis]

Note that I edited the referenced post as the indicated valve will not work. It opens with vacuum instead of closing.

Gary, I am perhaps getting a little confused... is there a valve that closes with vacuum that will work using the early controller port #1? I get that the pictured valve functions opposite, but is the idea still valid with the right valve?

As far as the web page write up, I can confirm that the HVAC controller swap is possible if you have the cable, vacuum harness, and function switch connector that match the HVAC controller, and the illumination pigtail that matches the truck harness. The things I still have questions are:

-1983 specific cable (I don't know what this difference could be, I've just seen the two types and 1983 has the "late" style switch. I see no difference between 1983/84/85/86.

-Non AC trucks... I have not looked at the controllers or cables to see if there are any different issues to watch out for. My guess is that the same changes were made (function switch plug, vacuum harness, and cable type) but I have not verified this.

Jonathan - Thanks. Yes, there is a vacuum-close valve - I have D6DZ-18495-A on the how-to page, but should have put it in this thread as it may be the only thing people read. 😩 However, there are lots of vacuum-close valves with 5/8” fittings. And I expected someone to take issue with the 2 vs 4-port thing, but there are also plenty of 4-port valves out there that close with vacuum.

Anyway, I’ll edit the info about the cable and the 1983 controls. Basically what we have then are:

• Two types of vacuum controls: 1980-82 and 83-86

• Two types of function switch connectors: 1980-82 and 1983-86

• Two types of illumination connectors: early vs late, but do we know dates?probably 80-82 & 83-86?

• Three types of cables: 1980 - 82, 1983, and 1984 - 86. But we don’t know what the 1983 cable looks like nor how it connects.

As for the non-AC trucks, that adds another layer of complexity. In 1981, judging by the EVTM there were three factory-supplied HVAC systems: Heater, which had no function switch; Comfort Vent, which had the same system as A/C; and A/C. But by 1986 the EVTM drops the Comfort Vent. So the Comfort Vent heater system would lend itself to this modification. Does that make sense?

Thanks again. 👍

[Ford F834]

Jonathan - Thanks. Yes, there is a vacuum-close valve - I have D6DZ-18495-A on the how-to page, but should have put it in this thread as it may be the only thing people read. 😩 However, there are lots of vacuum-close valves with 5/8” fittings. And I expected someone to take issue with the 2 vs 4-port thing, but there are also plenty of 4-port valves out there that close with vacuum.

Anyway, I’ll edit the info about the cable and the 1983 controls. Basically what we have then are:

• Two types of vacuum controls: 1980-82 and 83-86

• Two types of function switch connectors: 1980-82 and 1983-86

• Two types of illumination connectors: early vs late, but do we know dates?probably 80-82 & 83-86?

• Three types of cables: 1980 - 82, 1983, and 1984 - 86. But we don’t know what the 1983 cable looks like nor how it connects.

As for the non-AC trucks, that adds another layer of complexity. In 1981, judging by the EVTM there were three factory-supplied HVAC systems: Heater, which had no function switch; Comfort Vent, which had the same system as A/C; and A/C. But by 1986 the EVTM drops the Comfort Vent. So the Comfort Vent heater system would lend itself to this modification. Does that make sense?

Thanks again. 👍

Thanks Gary for the clarification. I read the tab and the part number but I was confused whether or not that referred to the one that ~didn't work. That's from reading bits and pieces on the go.

As far as the controllers, I'm seeing that the vacuum switch changed in 1983 along with the plug. Unless I am missing something I literally only see two types: 80-82 and 83-86, which corresponds to the change in graphics. I looked at four different examples of 1983's yesterday that had the new style vacuum switch. I just wish I had been more observant of the cables.

[Gary Lewis]

Thanks Gary for the clarification. I read the tab and the part number but I was confused whether or not that referred to the one that ~didn't work. That's from reading bits and pieces on the go.

As far as the controllers, I'm seeing that the vacuum switch changed in 1983 along with the plug. Unless I am missing something I literally only see two types: 80-82 and 83-86, which corresponds to the change in graphics. I looked at four different examples of 1983's yesterday that had the new style vacuum switch. I just wish I had been more observant of the cables.

I can add part numbers to the page as we get the details worked out.

And I’ve edited my 8:08 AM post to change the control dates. Thanks for that, I wasn’t aware that the controls actually changed in 1983. So, does it look right now?

And, did the illumination connector also change as of 1983?

If that’s right, it only leaves the cable issue to sort out. And it is possible that the 1983 cable fits the 1984 - 86 controls, but that they had a problem with the ‘83 and revised it for ‘84 - and forgot to change the 1983 catalog entry to show “replaced by”. That happens all the time in the catalog.

[Ford F834]

I can add part numbers to the page as we get the details worked out.

And I’ve edited my 8:08 AM post to change the control dates. Thanks for that, I wasn’t aware that the controls actually changed in 1983. So, does it look right now?

And, did the illumination connector also change as of 1983?

If that’s right, it only leaves the cable issue to sort out. And it is possible that the 1983 cable fits the 1984 - 86 controls, but that they had a problem with the ‘83 and revised it for ‘84 - and forgot to change the 1983 catalog entry to show “replaced by”. That happens all the time in the catalog.

That looks right Gary. I will look at the 1983 cables next time I go to see if I can find the difference. The upgraded/updated part is a good explanation of what may have happened, especially if the part number for the HVAC unit itself didn't change.

[FuzzFace2]

I need some help. How does the heat control cable connect to the 1985-86 control? The parts catalog shows there to be three different cables: 1980-82; 1983; and 1984 - 89. But, I thought there were essentially only two different control setups: 1980 - 84 and 1985 - 86.

Here's a pic of the cable I have from a 1982 truck and the 1985 control, and I don't see a way to connect it. What am I missing?

http://bullnose-enthusiasts.12971.n8.nabble.com/file/n4369/DSCN0533.jpg

That appears to be the stumbling block in swapping a late control into an earlier truck or vice versa. Here's what I've found of "connections":

• Heat Cable: This is the one un-answered question. So, if we can answer this one I think we will have this nailed.

• Vacuum: There's a vacuum harness for each of the controls, meaning early vs late, and you have to use the correct harness. But, the vacuum motors didn't change, so use the harness for the control you have.

• Blower Motor: The blower speed switch was the same from 1980 through at least 1989, so this connection is not an issue

• Tank Selector: There were several different switches, but they will swap from the early control to the later control and vice versa. So, this isn't a problem if you have both controls available.

• Illumination: The connector for the bulb to illuminate the control is different from the early to late control. But, the socket, wire, and connector can be easily swapped from one control to the other.

• Function Switch: The connector on this switch went from a square plug to a flat plug, but both have the same 4 wires. So Jonathan/Ford F834 has figured out how to pull the pins out of one connector and put them in the other, so this one isn't a problem either.

Bottom Line: If there's a way to use the same temp control cable then I can write up a how-to on swapping the controls. And then I can write up the how-to on the shut-off valve, which will refer the reader to the how-to on swapping HVAC controls. Make sense?

Gary, little late to the party, what does the other end of that cable look like?

I ask because that end pictured looks like the end that goes to the temp. door arm and the tab would get a screw thru it to the box.

Dave ----

[Gary Lewis]

I need some help. How does the heat control cable connect to the 1985-86 control? The parts catalog shows there to be three different cables: 1980-82; 1983; and 1984 - 89. But, I thought there were essentially only two different control setups: 1980 - 84 and 1985 - 86.

Here's a pic of the cable I have from a 1982 truck and the 1985 control, and I don't see a way to connect it. What am I missing?

http://bullnose-enthusiasts.12971.n8.nabble.com/file/n4369/DSCN0533.jpg

That appears to be the stumbling block in swapping a late control into an earlier truck or vice versa. Here's what I've found of "connections":

• Heat Cable: This is the one un-answered question. So, if we can answer this one I think we will have this nailed.

• Vacuum: There's a vacuum harness for each of the controls, meaning early vs late, and you have to use the correct harness. But, the vacuum motors didn't change, so use the harness for the control you have.

• Blower Motor: The blower speed switch was the same from 1980 through at least 1989, so this connection is not an issue

• Tank Selector: There were several different switches, but they will swap from the early control to the later control and vice versa. So, this isn't a problem if you have both controls available.

• Illumination: The connector for the bulb to illuminate the control is different from the early to late control. But, the socket, wire, and connector can be easily swapped from one control to the other.

• Function Switch: The connector on this switch went from a square plug to a flat plug, but both have the same 4 wires. So Jonathan/Ford F834 has figured out how to pull the pins out of one connector and put them in the other, so this one isn't a problem either.

Bottom Line: If there's a way to use the same temp control cable then I can write up a how-to on swapping the controls. And then I can write up the how-to on the shut-off valve, which will refer the reader to the how-to on swapping HVAC controls. Make sense?

Gary, little late to the party, what does the other end of that cable look like?

I ask because that end pictured looks like the end that goes to the temp. door arm and the tab would get a screw thru it to the box.

Dave ----

Dave - I'll get pics of both ends of the cable tomorrow.

All - I added several part numbers to the HVAC/Integral AC part number tab today. And, what I found says that there are only two vacuum harnesses - one for 1980 - 82 and one for 1983 - 86. So that confirms what Jonathan was saying.

But, as I said before, there are 3 different temp control cables, so I'd like to know the differences. Jonathan is to look when he heads to the salvage next, but if someone else has examples please take pics and post them.

[Gary Lewis]

Dave - I'll get pics of both ends of the cable tomorrow.

All - I added several part numbers to the HVAC/Integral AC part number tab today. And, what I found says that there are only two vacuum harnesses - one for 1980 - 82 and one for 1983 - 86. So that confirms what Jonathan was saying.

But, as I said before, there are 3 different temp control cables, so I'd like to know the differences. Jonathan is to look when he heads to the salvage next, but if someone else has examples please take pics and post them.

I got a bit more done on the how-to tab on the HVAC/Integral AC page. I've now realized that there are multiple ways to solve the heat problem. In fact, Bill proposed a new one with a vacuum solenoid and valve which will work with the later controls. So I created tabs for each of the ways and intend to flesh out each of them.

However, today I drilled the vacuum header/connector for the early controls and added a piece of plastic tubing that The Huck gave up. So, it is ready to go when the time comes to put that in Dad's truck. And, I took pics and put them in the tab, which means I think that tab is done, and I'll get to the other tabs after I am thankful and recover from overeating.

Dave - Here's the pic for the ends of the 1980 - 82 cable: