63-67 HEATER VACUUM SWITCH WITH AIR CONDITIONING ( ON HEATER BOX )

Description

* Plastic Replacement
* Replaces original brass switch

This switch works on low vacuum. When the plunger is in there is no vacuum to heater shut off valve and it is closed, shutting off the heat. When the plunger is out there is a lightvacuum to the heater shut off valve and it is open, turning on the heat. You will be able to feel the vacuum coming from the fat hose, but the vacuum from the small hose is very light. This is correct.