» » »

Pontiac Q&A

Ask Your Question

1990 Pontiac Bonneville Question: no heat?

 

Question

Camster, Huntington, NY, November 28, 2010, 12:43
 Technician

Car is actually an 86 Parisienne,but no category here.Heater core is not clogged.Zero heat in car.Am I correct that the next possible faulty item is the vacuum controlled valve at one end of a heater hose?One hose hot, one hose cold. Thanks.

1 Answer
Flag This
  • Answer #1

    DaveJHM November 28, 2010, 22:09
    Profile_thumbnail
     Master

    Per the GM manual I consulted, you have no heater control vavle on this car.

    If you have a hot inlet but cold outlet hose in your heater core, it has to be a restriction. You have flushed it and it is clear?

    Flag This
  • Reply

    Camster, November 29, 2010, 07:25
     Technician

    Thank you for researching.The core is clear-I disconnected the lines and attached two pieces of hose,ran a garden hose through it-AOK.The car does have a vacuum controlled valve on the manifold, to which one hose attaches.Vacuum is present when the heat is off, not there when on,so I'm assuming a stuck valve.
    Update: I replaced the heat valve-problem solved.Thank you again for consulting your manual.

    Reply
    Flag This