1. My 03 honda civic overheats when the heater is on but cools down when the A/C is on.
2. My check engine light is on. it indicates that the VTEC valve is bad i replaced the VTEC valve and erased the problem but it pops up again causing the car to hesitate/struggles to reach higher RPM's also most of the times it wouldn't past 4,000 RPM's unless i turn off the car.
SOURCE: honda civic vtec 1995 - 1998 engine wiring diagram
Go to your local library and ask the Librarian to get you on-line to the Automotive Repair Reference Center, and then to the EBSCO database...you will find all of your wiring diagrams there.
SOURCE: What could make my 03 civic ex overheat and cool
your heater has apparently restricted the coolant flow....hopefully a good system back flushing will cure the problem....use a flush obtained from a parts house....I would buy the hose kit for flushing as well...good luck to you
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