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I flushed my system out and now when the fans come on to cool the car off, my check engine light comes on but it goes back off when the fans stop running.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
What year car is it? Need to check for codes to get an idea of where to look first. Could simply have an air pocket. We need a bit more info. 
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Of course Adam is right on again. More info is required.
To check your ECM for codes, there is a bit of information here at these links...... check it out.
http://www.corvettephotographs.com/c4vettes/codes.htm
http://www.corvettephotographs.com/c4vettes/ecm.htm
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in Forum: C4 Engines, Driveline and Handling
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