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On the ''89 everything is controlled by solenoids so there are no
cables. I can see the water valve in the eng compartment and when the
control unit is acting up I can see it close the water valve and I can
hear flaps closing. I still have the original unit and there is a
slide type reostat that I think is the issue. If I can figure out the
wiring I may just jumper around it. I may have heat all the time, but
then I can always open the windows. It's getting pretty cool here at
night and in the mornings so I would prefer being a little warm to
freezing.


Nicholas Bourne wrote:[color=blue]
> "vinnie" <vincekim@hotmail.com> wrote in message
> news:1160690535.036647.308470@i42g2000cwa.googlegroups.com...[color=green]
> >I am on my second control unit in 2 years. The fan works fine, but
> > the heat turns on and off at its own will. I forced the water valve
> > open, but that doesn't fix it as I believe there is an air flap that
> > would need to be forced open. Does anyone know where I could find a
> > wiring diagram or know of a repair for this. Searching through
> > threads this seems to be a common problem. Thanks!
> >
> > Vince
> > Calgary Alberta Canada
> >[/color]
>
> I don't know if the 89 is similar to the 86 of not but in the 86 the systems
> are worked by cables from the back of the unit. These are held in place with
> dodgy little clips which I have seen break.
> Did you change the first controll unit?
> I would be doing two things I would pull the unit out of the dash to see if
> any of the cables are are not conneced correctly and to pull on any that are
> connected to the heater temp controll and see if that gives you constant
> heat.
> Secondly I would check to see if water is actually flowing through the
> heater system. The tap could be broken internally or the pipes clogged,
> after all no water flow no heat.
>
> Nicholas[/color]