View Single Post
Old 10-25-2011, 08:57 PM
Yak Yak is offline
Registered User
Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
Originally Posted by Mad_Matt View Post
So what would cause heat all the time? That is another issue I have. Thanks
in addition to the info above - the monovalve has a switched ground and a steady +12v with the ignition on. Normal rules of thumb like checking for voltage won't fully diagnose a monovalve that doesn't close to shut off heat.

No continuity to ground via the control unit = heat all the time.

Switched continuity to ground = controlled heat

No +12v at the monovalve will also result in full heat, but you need the +12v AND the path to ground.
Reply With Quote