Chassis heat problems

[ronmarabito2002]

Don: Have you checked to make sure your manual valves on the engine
are open. These valves are notorious for vibrating into a closed
position.

R.E. (Ron) Marabito, Dallas, TX 92WB40

--- In WanderlodgeForum@yahoogroups.com, "Don Bradner"
wrote:
>
> Until a few days ago, my chassis heat was working fine, now it is dead.
>
> The chassis heat on this coach is a lot simpler than has been
described for many others. No summer/winter valves, no always-on
Sporlans, no Webasto or Primus.
>
> The water system consists of a single Sporlan valve and a pump, both
actuated by a slide switch in the cockpit (below the backup monitor
controls). The valve should open and the pump turn on whenever the
switch is in the Warm position and the ignition key is on.
>
> When this is done (engine off in order to hear things), there is a
discernible click at the Sporlan, and the pump starts. After a few
seconds, a circuit breaker can be heard to pop, and it goes off. Maybe
ten seconds later the breaker resets and things run for a few seconds
more.
>
> Question: Could this be a stuck Sporlan (pump blowing breaker
because of back pressure)? I've looked through the various documents
available and don't see a good way to test a Sporlan valve.
>
> Don Bradner
> 90 PT40 "Blue Thunder"
> Posting today by satellite from Pea Soup Andersen's, Santa Nella, CA
>