Engine Cooling problem
1994 Lincoln Mark VIII V8 Two Wheel Drive Automatic 139000 miles
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the temp gauge on my mark 8 pegged on me the other day. now the last 2 times ive gottebn into it it overheated.its not loosing any coolant the heater isnt working, sometimes i can drive 2miles and itll get hot,the laST 2 TIMES IT LET ME GO 10 MILES OR SO ,WHAT HOULD I BE CHECKING