heating air conditioning panel on 1998 BMW 328i

my in car heater blower works when it wants and blows high hot temp when it decides to come on

Asked by for the 1998 BMW 328i
I know this is an older post, but I just ran across it. Did you get this resolved? If not, try replacing the capacitor on the HVAC control board, as described at the site below. I had your exact same problem about 5 years ago, followed this procedure to the T, and have had no problems since. Cost me $11 at an electronics store. The dealer quoted me $1300 to replace the entire control unit. Good luck. http://www.macadamizer.com/bmwfix.html
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These systems are fairly complex, with a computer module, sensors, actuators and all the wiring, there are so many possibilities. I would get the diagnostic trouble codes read out an diagnosed for starters. Also, have a shop check for any technical service bulletins that may be related to this issue.