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I have a 99 320E about 90,000 miles. I've had an ongoing problem for the last few years that no one can seem figure out. Everything is fine until the outside temperature is above 85. Once it hits that intense 85 or 90 degrees days the A/C doesn't work. It is fine until intense ambient temperatures.
What happens is that I start the car and the A/C kicks on and runs fine for 5 minutes, after that the compressor kicks off. If I turn the car off and then back on the compressor comes on and blows cold for 5 min and then turns off. I've had the compressor replaced, A/C service done. Solar sensor replaced. And the high pressure sensor replaced. I've had it to a half a dozen shops who specialize in foreign cars and no one can see to sort it out.
Again it only happens when it is like 90 degrees outside. Other than that it works perfectly.
Sounds more sensor related than mechanical. AC Temp Sensor evaporator, sensor temp around the drier or even the climate control module itself. As ilove190evo says the climate onboard diagnostics will shed some light ...
Hi, I am attaching the entire list from the diagnostic read out. There were no error codes at all.
1. 36
2. 33
3. 27
4. 27
5. 64
6. 73
7. this started at 12 but once the compressor kicked off it was at 08.
8. 36
9. 02
10. 3.5
11. 2.4
12. 4.1.
20. 0.0
21. Bouncing from 07 to 126
22. 00
23. 00
24 13
40. 71
41. 34
42. 00
43. 152
The EC light never came on. The other thing which is strange is it seems to only happen during the day. Even if it is crazy hot at night, the problem does not exist. I did have the solar sensor replaced and there was no error code with it. I also just had a full A/C service done and they said that the Freon level was full. Thank you again for any and all feedback.
Here are the list of diagnostic I got from fellow member here a while ago, for above.
01 = In-car temp sensor
02 = outside temp sensor
03 = left heat exchanger (heater core) temp sensor
04 = right heat exchanger sensor
05 = evaporator sensor
06 = coolant temp
07 = refrig. pressure in bar
08 = refrig temp sensor (23*9 = 23.9deg C)
09 = nothing
10 = Blower control voltage (great for evaluating blower controller problems)
11 = emissions sensor (B31) e.g. 3.1 = 31.v
12 = sun sensor 4.2 = 4.2v
20 = aux fan control 6.1 = 6.1ma (max 10ma)
21 = engine speed
22 = vehicle speed
23 = Circuit 58d e.g. 99 = 99% of battery voltage
24 = BATTERY VOLTAGE e.g. 12.5 = 12.5v
30 = left rear air conditioning heat exchanger temp sensor (not all vehicles; obviously)
31 = right side
32 = rear evap temp sensor
33 = blower control voltage rear 0.8(MIN) – 6.0(MAX)
34 = left rear temp selector
35 = right side
38 = software status e.g. 37 rear air conditioning
38 = hardware status e.g. 37 , rear air conditioning
40 = control module version software status
41 = control module version menu hardware status
42 = control module variant code 1st number
43 = variant code second number.
Several numbers seems pretty off. You may want to start from hooking up the manifold and check the pressure. AC have several sensors and switches that will either turn them on or off if the pressure is not right. Don't hook up those cheap AC can pressure gauge, It's not accurate and it only read the low side anyway. Do it during the day when the outside temp is, at least warm. Don't do it during night or when cold. You won't get a accurate reading when cold. Don't do it while it's super hot either. Pressure tend to get really high.
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