1987 Ninety-Eight Regency heater controls

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wsb - 11 Dec 2003 01:46 GMT

Hello,

The heater, defrost, A/C buttons work intermittently. Sometimes defrost
will work. Sometimes vent. Sometimes A/C. Never more than one or two
buttons will work. The unit is electronic.

Any one ever had troubles like this. I need the defroster to work, as a
minimum.

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William H. Bowen - 12 Dec 2003 03:41 GMT

If you can do with just defrost. a "quickie" way to do it is to
disconnect the vacuum feed to the vacuum storage box (the squate
plastic box to the passenger side of the brake booster. Plug the hoses
so you don' t end up with a vacuum leak. The reason this works is the
HVAC systems "default" condition with no vacuum is to place the system
in Defrost.

Long term solution is to get the system checked out: be warned, the
controller unit is not cheap. Best bet is probably to find one in a
junk yard and swap it out. To remove it you have to plull the 4 screws
under the edge of the dashboard and pull off the front face that
surrounds the HVAC control panel - you'll then find 4 more screws to
remove to unplug the controller. No vacuum hoses at the controller
itself - they are on the actuator unit mounted under the dashboard.

Regards,
Bill Bowen
Sacramento, CA

>Hello,
>
[quoted text clipped - 4 lines]
>Any one ever had troubles like this. I need the defroster to work, as a
>minimum.

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wsb - 14 Dec 2003 08:16 GMT

Thank you, I will try both solutions. The quick one first. Much thanks.

> If you can do with just defrost. a "quickie" way to do it is to
> disconnect the vacuum feed to the vacuum storage box (the squate
> plastic box to the passenger side of the brake booster. Plug the hoses
> so you don' t end up with a vacuum leak. The reason this works is the
> HVAC systems "default" condition with no vacuum is to place the system
> in Defrost.

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