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1984 944 cooling fan and overheating

Engine

Vehicle Information: Year: 1984; Engine (type, size, modifications): 2.4L ; performance header, external oil cooler, fiberglas nose; Total Mileage: 120,000;

Three weeks ago I drove Summit Point during a DE. On the track the car ran warm but no apparent problem. At one point I was black flagged for white smoke coming from the exhaust (new exhaust system?). When I parked the car the coolant poured out of the overflow tube and the reservoir was bulging. I lost about 2/3 of the coolant. Now at home the drivers side fan comes on as the gauge passes the first mark but I can't get the second fan to come on even well past the halfway mark. The fuses are intact and the fan comes on when I jump the circuit. The coolant seems to be flowing through the system- the radiator and the hoses all get hot.There does not appear to be any mixing of oil and coolant in the oil or the coolant tanks.How do I get the fan to operate properly and do you think I have a head gasket leak?

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