Fan kicks on when I turn heater on. on 1995 Chevrolet Lumina APV

Evening, I was driving my 95 Lumina APV yesterday & had thought I had the check engine light problem solved with replacing the vacuum hose to the fuel pressure regulator. I pulled the ECM fuse put it back in drove her a good 20 miles at all speeds. Before it would come on with in 2-5min. of driving her. So I turned the heater on & the fan kicked on (i have noticed this in past so not sure if this is normal) anyway as soon as I put the heater on the CEL went on & stayed on. I turned the heater off the fan kicked off but the CEL stayed on. There was no hesitation or anything running wise. I just don't understand why the fan would kick on when I turn the heater on & more so why the CEL came on then?. As I said a good 20 miles at all diffrent speeds & no CEL until I put the heater on!. Thank you! Will,

by in Camillus, NY on March 22, 2010
1 answer 1 comment
ANSWER by on March 22, 2010
Without knowing what code is stored in the computer, nobody can give you an answer.
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COMMENT by on March 23, 2010
Gee wiz thank you for that answer that must of took you all of 1sec. Really that was a BIG help!