Q&A

 Master

Customer Concern: No heat. Checked the heater water valve, found hot on one side and not on the other. Made sure that temperature control was on hot. Checked for vacuum to the water valve, found none. Removed the control panel and did a smoke test, found a yellow vacuum line under cover for dog house, was not connected to anything, the end was a Y connection. Applied vacuum to the Yellow hose and found vacuum at the water valve. According to vacuum diagram the White vacuum line is the water valve feed. But apparently this is incorrect.
Tests/Procedures: 1. Test for stuck water valve.

2. Locate the Orange hose from the temperature control to the recirculation vacuum valve. Connect the water valve Y into the vacuum line.
Potential Causes: Connection — Hose connection.
Water Valve

Tech Tips: Vacuum line is from the recirculation vacuum actuator control hose. The water valve gets vacuum only when maximum A/C is selected.