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Will the check engine light come on when the water pump is bad on 2004 grand prix?
Wiki User
∙ 13y ago
Not until the coolant temperature rises to a very high level or even boils over. When the water pump goes bad it usually (but not always!) starts making squeeling or rumbling noises. Next they will start leaking and THAT is what causes engine damage when the coolant drains out. If the old pump isn't leaking, making noise, or wobbling there is nothing wrong with it.
The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to a parts store or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
Wiki User
∙ 13y ago
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Just had the same problem on my Grand Am. It was the water pump.
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