That year model did not have a modulator valve on the transmission.
The vacuum line diagram on a 1985 Chevy Pickup can be found in the service manual. It details not only the location of each line, but its function as well.
The factory transmission that belongs in that 94 model did not use are have a modulator valve. But to answer your question the line goes to any intake vacuum source. That year truck should have the 4L60E transmission in it.
That transmission is electronic controlled. No need for a modulator valve.
The vacuum modulator on a 1989 Chevy K-1500 4wd 5.7 is underneath the transmission. It can be reached from under the car.
It does not have one.
That year transmission did not use 1
If your speaking of the vacuum modulator for the transmission, they no longer use them on the transmissions with overdrive and electronics. The powerglide, turbo 350 and turbo 400 used to use them.
If your transmission has a modulator it is on the side of the trans and it has a nipple on it for the vaccum line. I you. Mark
If your car has one, take the vacuum line to the modulator off and if there is fluid inside, the modulator is bad.
YOU can't. It don't have 1
On the back of the trans. There should be a vacuum line running to it.
On the 440T4 Automatic Overdrive transaxle the modulator is on the front of the case, A vacuum line leads to it from the intake manifold.