Joined: Sat Mar 04 2006, 01:49AM
Location: Phoenix, AZ
Posts: 154
I have a 68 fury and the blower does not activate when on the heat setting.It blows fine when on a/c.And the a/c pump is knocking are they rebuildable or is there anywhere to get a rebuilt/new one?
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
Sean Welcome to the Dock! You'll have some fun here and plenty of knowledge.
As I remember, in those days, the vents defaulted to the A/C position. IN the event there was a failure in the vacuum system somewhere, it was able to move air throughout the car. I think they later defaulted to defrost.
Anyway, there are a few things you need to check. I can't see the condition of your vacuum hoses, so I have to rely on your eyes. One of the most common places for this to happen is where the vacuum comes off the intake manifold. I am assuming you have power brakes. Follow the booster hose to the fitting on the Rear of the intake manifold. There should be two hoses, the booster and a little hose on the same fitting. The Hose is 1/8" ID so it's pretty small. Check and see if the hose has broken/slipped off or is pintched, Check that the little spur it plugs onto, on the manifold fitting, is in tact and not broken. Follow the hose all the way back to the fire wall to make sure it is in tact.
If all is well there, try to get your hand up to the vacuum switch and make sure the tubing harness is plugged onto the back of the switch. The switch has little plastic nipples on the back where the hose bundle plugs in. I know in the early 60's, they were prone to break off. If the hose bundle feels loose, the tips may be broken off. Or the hose is just loose. If it is, your controller may not be getting enough vacuum to operate the damper doors.
If all is well there, you can try to trace out all the vacuum hoses to the servo's that operate the doors. For the ones that are easy to access, try using a long piece of 1/8 hose, connect it to the engine vacuum port and run around to all the servos you can get too to make sure they are operating. If they mechanically move, that's good. If they don't, you may have a vacuum leak or the door is jammed.
If everything works, then the switch itself is bad. If that's the case, many vacuum switches will work. I think up to 72 will work. They are pretty easy to find.
Another god place to look is where the car was last worked on. Under the dash, under the hood. . . Start there then follow the above
You asked! LOL Let us know how you make out and don't be bashful!!!
Joined: Sat Mar 04 2006, 01:49AM
Location: Phoenix, AZ
Posts: 154
Thanks for the welcome,I checked all vacum lines are intact and the doors move for every position all the speeds for the fan work but it still doesn't activate when on the heat setting.
Joined: Mon Oct 10 2005, 10:45PM
Location: Lansing MI
Posts: 513
I'd guess the selector switch then. Assuming it's like my '65 the pushbuttons for heat/defrost/AC control the vacuum for the doors, and electrical contacts to activate the blower. <span class='smallblacktext'>[ Edited Fri Apr 14 2006, 01:10AM ]</span>
Joined: Sat Mar 04 2006, 01:49AM
Location: Phoenix, AZ
Posts: 154
the buttons work and the doors move and the fan works just not on heat Is there some kind of valve or something that prevents water from circulating through the heater core? Because I connected a jumper wire to the batt and tried butbthere was no heat but the doors were in the right position(crawled under the pass. side dash and checked).Maybe the car wasn't warmed up enough because I have an oil + trans cooler installed. Idunno <span class='smallblacktext'>[ Edited Tue Apr 18 2006, 05:47PM ]</span>
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
Sean
Yes there is a control valve. On that car, i am not sure where it is. The 68 boys have to tell me! But if it's vacuum controlled like my 71 Fury, on the wheel well, you need to be sure the vacuum is getting to the valve. But I somehow I think it's cable driven and is located behind the glove box. Look under the hood and see where the two hoses go into the fire wall. It would be on the end of the fire wall, near the hood hinge and fender well. The ones closer to the middle are the core.
Easy way to see if it's working is to open the valve with a hot engine, running, and feel the heater hose. If it get's hot, it's circulating. Then the damper on the core may not be opening. If it doesn't get hot, find the valve and see that the cable is connected. If it is and the valve is moving back and forth, the valve may be bad. Make sure the cable isn't kinked too. <span class='smallblacktext'>[ Edited Tue Apr 18 2006, 08:35PM ]</span>