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It kind of depends on which switch you are talking about. Most newer cars have two. One to send info to the computer and one to send to the gauge or light on the dash. No problem if the one in the dash is bad....other than you won't know if your car starts to overheat. The one for the computer is a little different. Yes....you can still drive it. However, it's not the best thing for the car. The computer adjusts just about everything on that car according to the coolant temp. If it's not getting that signal it goes to a "limp home" mode. Mileage, emissions and perhaps even shift points will be poor. It's best to get it fixed as soon as you can.

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Q: Can you drive with a broken coolant temperature switch?
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