AC + Thermostat on 2001 BMW 325i

Two times, in the last 15 mths, the ac / heat doesn't go on but the next day it’s fine. Last night ac was fine after 30 min in the store it was only blowing @ (?) 1/2 power then within 3 blocks full power just kicks in (that happened for the 1st time last night!) I have a 2001 BMW 325i with 96,000m and the ‘service engine soon’ light has come on, went off for two mths & is now on again. Other than the screw I picked up in a tire my car runs great (I don’t drive it every day – couple of times a week). 1 other quickie; hot day, keys locked in running car a little over 1 hr, if your thermostat is bad what happens to the car? Thanks, I hope you can help. MJ (It’s going in for at least the fluids changing as soon as I find the right place!)

by in Sunland, CA on May 25, 2011
2 answers
ANSWER by on May 27, 2011
you have a defective blower resistor, sometimes known as the final stage. as to your thermostat question, you never want to overheat a BMW. if the temp gauge goes hot or if you see a coolant leak, do not drive the car. your thermostat can set a check engine light. my shop has had to replace several engines in BMW's just because drivers do not pay attention.
ANSWER by on June 10, 2011
YOUR PROBLEM IS TRHE FSU CONDENSER.180.00 DOLLARS FROM BMW DEALER'YOU CAN SEE AT YOU TUBE-HOW TO REPLACE IT LIKE ONE HR JOB.BUY THE ORIGINAL PARTS.FIRST TIME I FIXED MINE I USED THE ONE FROM AUTOZONE (126.00 DOLLARS).IT ONLY WORKS FOR COUPLE OF HOURS AND IT STOP WORKING
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hi there thanks for ur answer it helped me...another thing is my ac works perfectly but when i switch it on the after 10-15 mins the temp. goes up...i havent understood what is the matter....i thin...