I recently did some work on my '87 EC and now need to reconnect the heater/AC vacuum control lines that come out from the fire wall to the engine compartment. I did not mark which line is which and was hoping someone here would know which vacuum line is the vacuum feed to the heater/AC control in the dash and which one gets connected to the heater core shutoff valve?

I have two plastic vacuum lines coming out of the firewall near the blower motor. One is white and one is a purplish/hot pink color. Which one should be connected to engine vacuum and which one goes to the heater core shut off valve?

Anyone know this by the color of the lines?

Bruce

Gray one is for the heater valve. Purple is the vacuum source to the control head.

Gray one is for the heater valve. Purple is the vacuum source to the control head.

Thanks for the info. Much Appreciated!