Re: [DMCForum] Heater...

["Walter Coe" <Whalt@xxxxxxx>]

Misha, now that you have felt the pipes running along the
frame and feel that they are not getting hot, this tells you
that little or no coolant is circulating there.  Next is to
find out why.  Like Johnny said, you could have a plugged
heater core.  Other things to check for:

See if a previous owner bypassed your heater core.  If it
was leaking, they might have just capped off the hoses going
to it.  This could have been done at the heater core or
closer to the engine.

Look for a kinked or crushed tube or hose.  This could be
one of the aluminum lines running along the frame, one of
the brass lines on the heater core or one of the rubber
hoses.

Check that the heater valve is working properly.  This is a
vacuum actuated valve in front of the engine (next to &
under the ignition coil in the engine compartment).  If it
has a problem, most likely it is stuck shut.  This valve
should only close when the mode switch is on MAX.  It sends
a vacuum signal to the valve causing it to close.

Consider that maybe you have some hoses routed the wrong
way.  Since you recently replaced your water pump you are
more familiar with where the hoses go.

Walt

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