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My truck is heating up..I replaced the thermostat. but it is still heating up..what do you suppose is the problem The engine light also went on..
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First, verify you have purged the air out of your cooling system following your thermostat replacement. If this is not done, it will seem like you are overheating. Then, find out what your check engine light is coming on for. Last, make sure you have good radiator flow. A restriction could cause an overheating issue. Also make sure your cooling fan operates properly.