My Spider over-heated last week after a few minutes of driving, sending coolant out the expansion tank. The outside air temperature was a few degrees above freezing. The radiator fan did not kick in. It seemed to happen after I opened the heater valve. I am not sure if it is an air in the system, a bad thermostat, a failed fan thermal switch or if the heater cooling loop was just by-passing the thermostat. Anyways, I was planning on replacing the cooling system components anyway. I was just waiting to park the car for the winter.
I couldn’t seem to find a diagram that showed all the cooling water loops in one single diagram, so I drew one up based on information from others on this site and some shop manuals. The diagram is for a 1982 Spider, fuel injected.
Are any corrections needed? Any suggested improvements? Let me know your thoughts, I will update and re-post the diagram as required.