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From: Mark on 15 Dec 2009 12:31
On Dec 15, 11:34 am, m6onz5a <corv...(a)comcast.net> wrote:
> On Dec 14, 6:59 am, "J.B. Wood" <john.w...(a)nrl.navy.mil> wrote:
>
> > Hello, all.  My 1990 Mercury Sable has lately been displaying some
> > unusual heating behavior:  With the passenger compartment temperature
> > set at 85F I only get cold air coming out of any of the ducts even when
> > the engine temp is nominal (mid range on the temp gauge).  The weird
> > thing is that after I drive the car to work and it sits outside all day
> > I always have loads of heat available when driving home.  The coolant
> > level is where it should be and the water pump and thermostat were
> > recently replaced.  Does anyone have an idea?  Thanks for your time and
> > comment.  Sincerely,
> > --
> > John Wood (Code 5550)        e-mail: w...(a)itd.nrl.navy.mil
>
> > Naval Research Laboratory
> > 4555 Overlook Avenue, SW
> > Washington, DC 20375-5337
>
> I just read a couple of TSB's on the blend door having issues with the
> cable etc.. It also mentioned something to the effect if you are
> having a problem with the blend door turn the key off and back on and
> see if it works then.

I had a heat problem in a Taursu casued by a clogged heater core.
There is a bypass hose right across the input to output of the core
located on the firewall so just becasue you have flow through the
heater core hoses doesn't mean the flow is actually going through the
core, if the core is clogged, the flow will go through the bypass
hose.

I carfully pinched the bypass hose with vise grips to force flow
through the core and back flused the core. that fixed it for me....
YMMV.

Mark
From: ben91932 on 15 Dec 2009 16:53
On Dec 14, 3:59 am, "J.B. Wood" <john.w...(a)nrl.navy.mil> wrote:
> Hello, all.  My 1990 Mercury Sable has lately been displaying some
> unusual heating behavior:  With the passenger compartment temperature
> set at 85F I only get cold air coming out of any of the ducts even when
> the engine temp is nominal (mid range on the temp gauge).  The weird
> thing is that after I drive the car to work and it sits outside all day
> I always have loads of heat available when driving home.

There is an in car temp sensor behind the glove box and a sun temp
sensor under the left side of the dash.
If there is no air in the system, I'd take a look at those.
HTH,
Ben
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