how do i know when my themostat is going bad
my car is heating up to and between the middle and the 260(Red) mark when i drive. but when i drive with the heat on it goes down but still Fluctuates when stoping at a light. how do i know that it is my thermostat and not something else?
There really is no easy way of knowing. It could be the thermostat, the water pump, the radiator. There are a lot of reasons why it would go up and down. I would take it to a mechanic and have a diagnostic check done.
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