My car hasn't been heating up that well the last couple weeks. It's been about 30-40 degrees outside and the heat has just been blowing warm, but not hot. The coolant reservoir is full, and the car is not overheating. I can only think that I have a thermostat stuck in an open position. Can someone verify for me that there isn't anything else I should check before ordering a new thermostat? Thanks for your help. Have a great Thanksgiving weekend. -Joe

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'86 300E (241K)