Also - pull the rubber hoses off of the metal. There are four places
where this happens, 2 of these locations are at the front passenger
wheel, the other two are at the rear passenger side under the
removable sheetmetal plate thing. (Careful, there are also A/C lines
running here - don't open those!)
Once you have the rubber hoses off, check for restrictions. I had
deposits formed at each end of both supply & return metal heater core
lines that were acting as "caps" - I didn't even notice them the first
time I had the hoses off. For some reason I ended up pulling them off
again and while feeling around in there, felt that the pipe seemed
rather solid, instead of hollow. I used a piece of wire to break up
the debris and a blast of air at 90psi to clean the pipes out. Careful
here that you don't vaporize the old nasty coolant here. I'd go with a
less intensive burst of air to get the coolant out intact, then hit it
with 90psi to get the remaining gunk out.
-Ryan
--- In DMCForum@xxxxxxxxxxxxxxx, "Walter Coe" <Whalt@xxxx> wrote:
> 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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