- Joined
- Mar 11, 2013
- Messages
- 10,574
- Location
- South Bucks
- Car
- CLS63 SB, SLK55, Cooper S, Triumph Sprint (Bike not Dolly...),
My '03 S211 is not blowing hot air, only cold. To check it wasn't one of the cabin temp sensors, I put the iCarsoft MB II on it; the overhead sensor read 11.5 degrees, the dash sensor minus 99 degrees. Bingo! (The dash sensor was loose on top of the lower panel, and the only thing I've found online states it can be replaced in its correct location without further dismantling. Maybe by Inspector Gadget it could, but not with my big mitts it can't; I couldn't get closer than best part of a foot near it).
Replaced the sensor, left it on top of the lower panel, with a foam collar to stop it rattling around too much. and now both sensors read within a degree or two of each other. then ?
Er, no; it still only blows cold...
There's no difference between front and rear; both only blow cold.
No fault codes now, but as far as I can find, the Carsoft doesn't provide OBD for either the duovalve or the aircon/heater control panel.
All four heater demand temperatures were set at 30 degrees throughout, except where indicated otherwise. The aircon was set to off at all times. I still think the duovalve is the most likely culprit, but some of the heater flap positions seem odd, depending on whether the manual air distribution is set to screen, chest, footwell, or mixed footwell/screen. I'm assuming that 0 means a flap is closed.
The charcoal filter and recirculation flaps function normally, though the recirc warning light was flickering on and off irregularly without being touched.
In case it helps, I've attached a chart of the various readings.
I'm assuming that the system is bright enough to discount the implausible -99 temperature reading from the u/s dash temperature sensor and use the upper sensor's reading, so something else has gone wrong. I still suspect the duovalve, but the system has done this two or three times before, and fiddling with the controls brought it back to blowing warm again.
Is there any easy way to check the duovalve, and do the flap settings all look OK?
Replaced the sensor, left it on top of the lower panel, with a foam collar to stop it rattling around too much. and now both sensors read within a degree or two of each other. then ?
Er, no; it still only blows cold...
There's no difference between front and rear; both only blow cold.
No fault codes now, but as far as I can find, the Carsoft doesn't provide OBD for either the duovalve or the aircon/heater control panel.
All four heater demand temperatures were set at 30 degrees throughout, except where indicated otherwise. The aircon was set to off at all times. I still think the duovalve is the most likely culprit, but some of the heater flap positions seem odd, depending on whether the manual air distribution is set to screen, chest, footwell, or mixed footwell/screen. I'm assuming that 0 means a flap is closed.
The charcoal filter and recirculation flaps function normally, though the recirc warning light was flickering on and off irregularly without being touched.
In case it helps, I've attached a chart of the various readings.
I'm assuming that the system is bright enough to discount the implausible -99 temperature reading from the u/s dash temperature sensor and use the upper sensor's reading, so something else has gone wrong. I still suspect the duovalve, but the system has done this two or three times before, and fiddling with the controls brought it back to blowing warm again.
Is there any easy way to check the duovalve, and do the flap settings all look OK?