Ran the tests and I assume 1 to 4 refer to these:
B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
And 5 to 9 refer to these:
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
The values for 1-4 made sense and seemed accurate, relative to ambient temperature (80-90 degrees). Values for 5-9 were off -- by
EDIT: 12-70 degrees -- relative to ambient. (I had not started the car since yesterday, so all should have been at or near ambient.)
The sensor replacement, as expected, had the nasty surprise I was wary of: The old sensor melted/fused into the socket, which itself crumbled. So I will be replacing that also -- and I would advise anyone who does this job to spend the few extra dollars on that, in case you need it.
Overall, the job itself is straightforward --
IF you know to remove the secondary air pump first (and how easy it is to do it). I did not, at least not for the first hour...
Getting the sensor clip off without removing the air pump is easy; getting it back on without doing so is impossible.
With sensor not present, I have a new CEL but still no aux fans, which I assumed would kick on like they did in my W124's, when said sensor was disconnected. Or are the 210s somehow different?
Quote:
Originally Posted by 97 SL320
I'm pretty sure this still has the older heater control that goes back to 95 or so. ( long thin display, buttons all around )
With the key on or engine running, turn the fan to low. Press and hold the " REST " button and wait. The display will go to a data screen flashing a 01 then another number. Use the fan - and + buttons to scroll through the screens ( 02 , 03 , 04 ) Engine coolant temp is somewhere in the 05 to 09 range.
If the coolant temp is showing a believable temp, changing the sensor won't fix your problem. There is only one coolant temp sensor, it is connected to the engine computer then data sent over CAN bus to trans . HVAC , dash.
You can also get diagnostic info with other buttons. The type of control was used on most all MB from 95 to 01 or so. They do not directly interchange as the E and S had split temp and the C / SL single temp.
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