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Your cooling system needs to be checked out. Your car is obviously overheating. If you leave it stopped at a light too long, chances are you will totally screw your engine. Could be a radiator, water pump, the coolant, or something more serious. Find a mechanic or a friend who knows his stuff.

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14y ago
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Q: Why would the temperature go up and down on a 1990 Toyota Tercel especially when stopped at red lights?
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