Any constant source would be fine. Straight off the manifold, or the throttle body of the carb would work.
On some of the older vehicles the vacuum modulator controlled the shift points of the transmission by using the vacuum supplied from the engine.
The transmission does not have a vacuum modulator.The transmission does not have a vacuum modulator.
The transmission in a 1991 Chrysler does not have a vacuum modulator.The transmission in a 1991 Chrysler does not have a vacuum modulator.
The transmission on a Chrysler Sebring does not have a vacuum modulator.The transmission on a Chrysler Sebring does not have a vacuum modulator.
engine vacuum or direct into the intake.
I'm not a mechanic / technician but I believe it can if the automatic transmission uses a modulator valve that has a vacuum line connected to it because the vacuum comes from the engine . If there is a problem with the modulator valve then the transmission fluid could be sucked into the engine
When the vacuum from the engine sucks in transmission fluid from the bad modulator and shows up as heavy blue smoke out the exhaust.
Be sure the vacuum supply line from the engine to the transmission vacuum modulator is not disconnected.
assuming your talking about the transmission modulator...visually inspect the transmission and look for a vacuum hose from the engine to the tranny...
It's a constant source such as the intake manifold or the base of the carburetor.
Yes, this really can happen. The transmission modulator ruptures and vacuum system system draws out trans fluid into engine oil thru vacuum pump into engine crankcase. Been there, done that. I replaced the modulator valve and dropped engine oil.
The vacuum modulator is located on the passenger side of the transmission, just above the tranny oil pan. It has a vacuum line going to it. It actuates a valve in the tranny for upshifts.