While my son was driving our 1992 745 Turbo Wagon the upper radiator pipe sheared off pumping out all of the coolant before my son arrived home. I checked the oil, still between the marks and the engine would turn over. I replaced the radiator, both the upper and lower hose, the valve for the heater near the firewall per brickboard suggestions, and replaced the antifreeze. The car runs fine. I have several questions: 1. About two months ago I replaced the Black reservior cap because it had a crack in it. The Volvo dealer sold me a green one saying it is a replacement for the black one. IPD says it is the wrong cap, the green cap being a higher pressure cap. Please advise. 2. After driving the car today and letting it sit around two hours, there was only a little antifreeze in the reservoir. I slowly let the pressure out and the reservoir filled to the correct mark. What does that mean? Please advise 3. The "Check Engine" light is still on. Should a dealer check the car out or can I reset this light? Please advise. The guys on this brickboard have been helpfulin the past and the info I received on how to replace the radiator was spot on. Thanks in advance.