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C60 My car is far from stock and I don't know what the device in the picture does not do I really care. I assume it's some sort of backfire valve that went to a couple of devices. All I care about it the small plastic hose that emerges from the wiring harness behind the distributor. 1990 L98. I want my C60 to still be able to control the vents in the dash. I assume this is just a matter of hooking this line to a vacuum source and I should probably have a check valve for backfires.
Federal standards require non-mechanical HVAC controls to revert to defrost in the event of the loss of vacuum or electrical power to the control system. With no vacuum, the doors move to full defrost.
It is a check valve. The pointy end goes to manifold vacuum. One of the ports on the flat end goes to the hard line that goes into the interior for the HVAC. The other port on the flat end goes to the vacuum reservoir. (The "ball" that was originally on the front side of the LF inner wheel housing.) The check valve is intended to maintain vacuum for the HVAC when the throttle position may be producing low vacuum. Without the check valve or the reservoir, the HVAC doors will change state under low vacuum conditions, ie revert to defrost.
Federal standards require non-mechanical HVAC controls to revert to defrost in the event of the loss of vacuum or electrical power to the control system. With no vacuum, the doors move to full defrost.
It is a check valve. The pointy end goes to manifold vacuum. One of the ports on the flat end goes to the hard line that goes into the interior for the HVAC. The other port on the flat end goes to the vacuum reservoir. (The "ball" that was originally on the front side of the LF inner wheel housing.) The check valve is intended to maintain vacuum for the HVAC when the throttle position may be producing low vacuum. Without the check valve or the reservoir, the HVAC doors will change state under low vacuum conditions, ie revert to defrost.
This was about the best response I could have ever got. The only thing I didn't ask in my original post was how to get it into the defrost mode as that's all I'm ever going to use anyway! Thank You for the info.
C60 AC controller Vacuum source
