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Car Forum / Porsche / Porshe 944 / January 2007My 1987 heater seems to deliver less heat to the passanger compartment
My 1987 heater seems to deliver less heat. When I push in the DEFROST button, on this 944 the system defaults to full HEAT, ac compressor on, and all heat directed through the windshield vents. In that condition I get full heat as expected. VERY HOT and everything works correct. BUT when I just turn up the temperature control on the dash, I get LESS heat than expected. The temperature control thermostat on the dash appears to work properly - you can hear the click that the system is going on and off. I replaced the heater's INTERIOR TEMPERATURE CONTROL, but still I dont seem to get the full heat condition (as when I press in the DEFROST button). Any ideas? Thanks!  Signaturejoliett -------- There is a little plastic clip on a metal rod that frequently breaks under the dash and controls a flap that diverts the hot air. This could be broken. I forget the specifics about it, but an internet search, and perhaps the 944 FAQ may point you in the right direction. Good luck! > My 1987 heater seems to deliver less heat. > [quoted text clipped - 11 lines] > > Any ideas? Thanks! Anyone know how to get to the heating system mixing chamber sensor? Signaturejoliett -------- > There is a little plastic clip on a metal rod that frequently breaks > under the dash and controls a flap that diverts the hot air. This [quoted text clipped - 23 lines] >> >> Any ideas? Thanks! > Anyone know how to get to the heating system mixing chamber sensor? Remove the dash surround (includes centre vents) & you should see the wire in the centre of the vent hole - comes up from the middle & the thermistor is clipped in place, it should just pull away. The wire has thick black shielding on it, if you use a torch to see what you're doing it's not too hard to get to, it's soldered to the wire though. Have you followed the diagnostic procedure in the manual & determined which of the three thermistors has failed & whether it's failed open or closed? Malc. I was reading the manual very carefully - I thought taking out the heater control panel from the dash may be too much work. I already replaced the interior sensor, and I checked the outside heater sensor and it's ok. So it must be the mixing chamber sensor. Today, after checking the exterior sensor, the heater was like a furnace for about an hour - now it's back to not enough heat again. I'm going to try and get to the mixing chamber sensor next. Right behind the removed grill -- I'll let you know. Thanks. joliett -------- >> Anyone know how to get to the heating system mixing chamber sensor? > [quoted text clipped - 11 lines] > > Malc. Can this heat mixing sensor be removed from the other side with a connector? Or is too difficult to reach and so you have to splice the wires neat the sensor? Signaturejoliett -------- >I was reading the manual very carefully - I thought taking out the heater > control panel from the dash may be too much work. I already replaced the [quoted text clipped - 28 lines] >> >> Malc. > Can this heat mixing sensor be removed from the other side with a connector? > Or is too difficult to reach and so you have to splice the wires neat the > sensor? I looked for a connector when mine failed last winter & was unable to find one (the wire goes straight into the taped up main loom). It may be possible to replace a large portion of the heater wiring loom but I just soldered a replacement thermistor in - it's not a visible part of the car so I wasn't worried about it looking 'factory' ;-) I have removed the 'intake' thermistor (the one in the engine bay) because mine was shorting out continually - this forces my heater to assume the outside air temperature to be cold but having used it like this for the past year there appear to be no ill effects (in the UK climate at least). My aircon doesn't work - it may have an effect on it's ability to cool below ambient in a hotter climate. Malc. > >I was reading the manual very carefully - I thought taking out the heater > > control panel from the dash may be too much work. I already replaced the [quoted text clipped - 28 lines] > >> > >> Malc. Well I fixed my heater...If the heater works full force when pressing the heater defrost button on the dash, but then doesn't work when operating normally, it means a sensor is broken. If the heater goes on full heat, then when it reaches the thermostat's settings and then it goes off - its the snifter sensor located behind the glove box. If the heater runs, but with less heat - it's the sensor behind the main ventilation grating. I changed the ventilation sensor and it worked!!! Signaturejoliett -------- >> Can this heat mixing sensor be removed from the other side with a > connector? [quoted text clipped - 57 lines] >> >> >> >> Malc. |
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