Sacha, Even if the thermostat was stuck closed, which I doubt, the engine should not overheat as quickly as you described. The thermostat is not expensive so if you wish, you could replace it in order to eliminate it as a possible cause of your problem. One more suggestion: a cooling system pressure tester would be very helpful in nailing down the problem. Thanks for the product plug but I would like to take this opportunity to pass on the correct name of this device to eliminate confusion with other similar products. The official name is "Overheat Protector" and is available at the DeLorean Service Store. For more information on this popular product check out http://www.geocities.com/dmcjoe/overheat.html DMC Joe "We're here to help you" DMC Help / De Lorean Services / <dmchelp@xxxx> Web Site: <http://www.deloreanservices.com"> DeLorean services.com DMC.tv is in your future ..... [moderator snip]