'91 BMW 318i- Started vehicle, turned on air conditioning & nothing. Can you please advise.

do you mean the fan didn't come on?

you'll have to check the blower motor fuse and the fan relay frist, if ok then insp. the motor resistor.
do you have the owners manual?

what have you checked so far?

here's a bulletin i found on blower motor, may not apply but check it out.
if you wants the pics, i'll send to a email ad.
let me know

A/C - Blower Speeds Inoperative/Intermittent Fan Output

9232bmw01

Group 64
Heating and Air Conditioning

Bulletin Number
64 05 92 (3503)

Woodcliff Lake, NJ
May 1992
Product Engineering

SUBJECT:
IHKR Blower Resistor Assembly Failure

MODELS:
E36 (prior to 9/91 production)

Situation:
A complaint is received such as blower speeds inoperative or intermittent fan output on fan speed settings 1, 2, or 3.

Cause:
The support plate of the blower resistor block can heat up, causing an increase in resistance to the thermal switch. As a result, the switch heats up even more and eventually opens. The unit has been redesigned, and orients the thermal switch 180 degrees in position as compared to the older style. Refer to illustration.

Correction:
If one of the above complaints is experienced, replace the blower resistor unit.

This shortcoming has been fixed in production for 9/91 and later vehicles. BMW NA will purge its stock of the older units.

Note that the unit is best accessed from inside the vehicle. The blower resistor is located on the left side of the blower housing, above the driver's footwell.

PartsInformation: Description Part Number

Blower Resistor 64 11 1 393 211

http://www.dvatp.com/bmw/diy/hvac_blower/
once you get to the blower, unplug the blowers' wire connector. use a test light to check for power at the blower motor wire connector. If power is present, check the ground wire to be sure it provides a good ground. If power and ground are ok repalce blower motor.

If you have to change the blower motor it's a good time the replace the cabin filter as well (if equipped).

i'll send out info tonight, at work now.

check email and let me know, mws919

good hunting, let me know if you need more.

I have a 1997 ford f-150 pickup 4.6L miles 211,000 put it in a firestone auto care store in pelham AL. this morning to see what was wrong with the a/c,was not cold but blowing .they said it was the suction&dischrg assm.we replaced the manifold&tube assembly,replaced the accumlaton&receiver drier,replace drive belt,and all the hoses too!all that they said too !the cost was $851.07 dallars, then they said it was another part the mode door actuator. it will be another $405.26 do you think that all this work was required...

alrose620,

Not only are you asking your question in the middle of of another individuals posting, but you asking your question in a posting that was started on January 16 2011. So that we can help you in the proper manner, start a new posting for your question. Tell us in detail exactly what the problem is. Be sure to post the year, make, model, mileage, and engine size of your vehicle.