My vacuum source tees off the cruise control line. My vsv broke last winter, and I by-passed it. Now, the vacuum line runs straight to the vacuum motor. This is OK, because the vsv is an on/off deal, and activates the motor anytime the temp setting on the dash is above minimum. Temp is controlled by blend doors under the dash. Heat works fine for me.
Mine is an '88 N/A Supra.
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