1970 Wagoneer Heater Switch Vacuum Leak

Stock FSJ Tech Area
Post Reply

Topic author
spjohnson1031
Posts: 20
Joined: Mon Jun 21, 2021 7:59 pm

1970 Wagoneer Heater Switch Vacuum Leak

Post by spjohnson1031 »

Hello all,

I'm in the process of returning my 1970's heat back to factory (previous owners wired straight to the blower motor, bypassing the switch). I've gotten power back to the switch, but I have a big vacuum leak coming internally from the switch itself. It's leaking between the two circular plates above where the vacuum lines enter the switch assembly (see in the pictures below). I separated the two circular plates and did not see anywhere that an o-ring would exist or be able to even fit. I can't silicone the two pieces because the top one needs to spin. Any idea what exactly the solution for a vacuum leak is here?

Thanks in advance!

Scott
1970 Wagoneer, 350/th400
Chicago
You do not have the required permissions to view the files attached to this post.
~Scott

1970 Jeep Wagoneer
User avatar

tgreese
Posts: 7117
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: 1970 Wagoneer Heater Switch Vacuum Leak

Post by tgreese »

I recall someone showed a repair where they lapped the surface of both plates and put a bit of grease between them. No gasket? Or there was a flat gasket? I searched on IFSJA, but did not find that thread. Maybe you can search and find it here or there.

The parts book shows it as an assembly, but as you see you can take it apart and spiff it up.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

twisted frame
Posts: 637
Joined: Wed Mar 27, 2013 9:41 am
Location: Massachusetts

Re: 1970 Wagoneer Heater Switch Vacuum Leak

Post by twisted frame »

This is the best thread I've found for this: https://www.fsjnetwork.com/forum/viewtopic.php?t=10471
73 J4000. 360, MC 2100, T18A, D20, stock closed knuckle Dana 44 front, 60-2 rear. Warn Lock-O-Matics, Warn/Belleview electric winch, true duals with glasspacks, old-school front diff skid plate, used 265 Toyos on 16" AR wheels.

Srdayflyer
Posts: 398
Joined: Mon Mar 18, 2019 2:08 pm

Re: 1970 Wagoneer Heater Switch Vacuum Leak

Post by Srdayflyer »

i am restoring an 83 cherokee and rebuilt my heater control, it works like butter now. its very simple (after) you remove it lubricated the push button actuators with a light oil and reoiled the Felt lubricator pads and lapped the mating surfaces of the valves ,there is no gasket and a light grease was used and it now works like new

Topic author
spjohnson1031
Posts: 20
Joined: Mon Jun 21, 2021 7:59 pm

Re: 1970 Wagoneer Heater Switch Vacuum Leak

Post by spjohnson1031 »

Thanks, everyone!
~Scott

1970 Jeep Wagoneer
Post Reply