1959 Olds 98 Heat and Vent Controls - ClassicOldsmobile.com


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Old May 16th, 2018, 05:11 PM   #1  
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1959 Olds 98 Heat and Vent Controls

I think my dash controls have a vacuum leak. I got vacuum up to the tee under the dash just before the controls. I bypassed the controls and the blower worked and heat came out from the core. But nothing when hooked up. So I think the rotary control may have a leak.


How do the controls come out. Looks like from behind but what a hard way to remove them.


Anyone know how they come out? This is a non AC car.
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Old May 16th, 2018, 06:28 PM   #2  
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As I read the shop manual. To get heat, the control on the vents must be off and to get vents the heat control must be off.


So off must be when no vacuum is allowed into the controls. So if I block the vacuum to the vent control and try to operate the heat and if it works I may have a vacuum leak in the vent control. If I do the opposite and plug the vacuum line to the heater and operate the vent and it works the leak is in the heater control.


Would this be correct?
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Old May 16th, 2018, 06:57 PM   #3  
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Maybe this can help ;



The vacuum leak is likely to be in the 60 year old hoses .




Charlie

Last edited by Charlie Jones; May 16th, 2018 at 07:26 PM. Reason: wrong pic
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Old May 16th, 2018, 07:50 PM   #4  
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I have good vacuum to the tee in the diagram. It's bad coming out of the controls since I bypassed the control and put vacuum to the heater diaphragm and blower. That worked. Blower blew hot air into car.


I am trying to determine if its in the control. Then I can go from there out to the diaphragms.


So I was thinking block off one side of tee where vacuum line comes in and see if the other side control works and vice versa.

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Old May 17th, 2018, 12:21 PM   #5  
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Quote:
Originally Posted by gkhashem View Post
I have good vacuum to the tee in the diagram. It's bad coming out of the controls since I bypassed the control and put vacuum to the heater diaphragm and blower. That worked. Blower blew hot air into car.


I am trying to determine if its in the control. Then I can go from there out to the diaphragms.


So I was thinking block off one side of tee where vacuum line comes in and see if the other side control works and vice versa.
Yes , that may tell you something .

However , you might want to check for dry , cracked , or split hoses . And , using the diagram , check that each hose is properly connected .

Those are rotary valves . Have you checked to make sure the mechanism is actually turning the rotor in the valve properly ?
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Old May 22nd, 2018, 02:50 PM   #6  
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How about removing these? Any tricks it looks like a pain to do.
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