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RE: heating woes, continued
Thanks for your help. Here's what the lunchtime parking lot excursion has
I found the programmer and observed the Bowden cable to be stuck in the cold
position, pointing to the left. (Note: the heater control valve at the
firewall seems to be functioning normally) When I switched to 'HI', the arm
had trouble moving, but with some 'assist' I got it to travel to the hot
position. Then I got heat from the vents. Various LO to HI tests indicate
that something is sticking -- either the cable or the flap. At one point I
was getting a clicking sound from the little motor/arm as it was unable to
force the cable to move.
What should I plan for the 2:00 coffee break? :-)
> -----Original Message-----
> From: Dan Simoes [SMTP:email@example.com]
> Sent: Monday, March 23, 1998 11:46 AM
> To: BTitus@njaost.ml.com
> Cc: firstname.lastname@example.org
> Subject: Re: heating woes, continued
> > the heater control valve definitely moves its
> > full travel. So, if there is coolant in the system (and not on the
> > the engine is warm, the control valve actuates, and the fan blows, why
> > heat to the cabin? Blockage in the heater core or hoses? hmm...
> You're talking about 2 different things here.
> Here is what I would check (based on a CQ, but similar?):
> - in the engine compartment, there are two hoses at the firewall.
> Feel them both - are they both hot? Odds are they are not.
> - one of those hoses, probably the leftmost, leads to a plastic
> plunger-looking doohickey. This is the heater control valve,
> which is controlled by vacuum. Try moving it by hand, or
> note the position at 72deg, now move it to LO (temp) inside
> the car, come out and see if it moved.
> - if this valve is moving, and inside the car the arm is cycling
> from hot to cold, the next step is to check the CC head diags.
> Press and hold the outside temp button and the OFF button.
> Pressing the warm/cold will cycle you through the channels,
> the most important ones are channel 1 (should read 00, 15 if
> there is a problem with the temp regulating motor, if you have
> one), channel 8 (actual position of the temp regulating motor)
> and channel 9 (specified position of the trm). If channel
> 8 is off by more than 3 units, in relation to channel 9, there
> is a problem with the temp reg motor.
> Hope that helps.
> | Dan |