When installing the original air cleaner on My '70 GS 350, how do I connect the vacuum lines? I'm thinking I would run one line off the carb, to the air cleaner. On the air cleaner there would be a "tee", which from there would go to the 2 "air flaps" in the snorkels......does this sound right?
All the air cleaners hook up the same way. There is a hose running from a manifold vacuum source (carburetor or intake) to one side of the air cleaner temperature sensor. The other side of the sensor gets a hose to the snorkel vacuum motor. Yes, tee off that line to both snorkels. The temperature sensor modifies the manifold vacuum to the snorkel flaps to keep them at the right angle to keep air inside the air cleaner at ~115*.
The vacuum lines your talking about are for the hot air from the exhaust manifold stove and flex tube from the drivers side (left side) exhaust manifold for cold weather operation. Theres a "thermac" sensor in the base of the air cleaner that senses air temp. and opens (for hot air) or closes off the hot air from the exhaust manifold to the air cleaner. The vacuum lines your asking about go from the carb to the thermac sensor, then from the sensor to the "T" then from the "T" to each vacuum motor on top the the two snorkels. You'd have to refer to the service manual for exact line routing, as I dont remember exactly. OR, you could attach the vacuum lines to the nipples on the vacuum motors on the snorkels as "dummys" and render them inoperative so the engine injests outside air all the time. In other words, having them operating CLOSES OFF COOLER AIR from outside the engine compartment on a cold start.
Perfect....Thanks for that info. I didn't know at all about the temp. sensor. Do you suppose that sensor is available as a replacement part?
http://www.v8buick.com/showthread.php?209578-GS-air-cleaner-Temp-sensor Have you looked to see if the sensor is there? It should be unless someone removed it, and why would they do that?
I just checked and the sensor is there......43 years old. Do these things, ...go bad? It looks complete, has a coat of.... blackness.... on it, but it's there
No, they generally last the life of the car. BTW, the only benefit to having the air cleaner doors working is during cold weather. The stock carburetor jetting is a bit lean to work with the hot air in the air cleaner.
So true......I'm gonna go without for now. I've owned this GS for most of its life, and only now am I beginning to get things working as they should. I rebuilt the carb with lots of help from Cliff R. and this forum. Today I fabricated a rod for the divorced choke and connected it. The car actually starts now without almost killing the battery. Yeah.....feels GOOD! Thanks..........
