Hello Ken & Bob.
I have a 1998 Chev C1500. I have a problem of late with the ABS light coming on in the dash, when this happens the heater fan will not work. Everything else works normal. You can be driving along and for no reason the heater fan will start and the ABS light will go out, only to have it come back on the next time you start the vehicle. I have checked fuses, wire connections on the ABS module, heater wire connections, etc; nothing seems to make any difference. My vehicle has 298000 km on it and is in real good condition, except for the above.
What do I look for next?