- Sep 4, 2010
- 9
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Problem with the low coolant light staying on on my 1990 Mustang 5.0. It has plenty of coolant, is not overheating, not leaking (the system has been leak tested twice - good) and I've replaced the sensor in the coolant overflow reservoir. The only thing I can see wrong is the reservoir cap will not tighten up. Have you ever seen this problem?