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Why would the cooling fan not come on a 91 sunbird replaced cooling fan motor and relay cooling fan now comes on when you jump across buut not with new or old relay in?
Wiki User
∙ 16y ago
When you jump across it, you are shorting out the circuit - commonly used for testing components to see that they will turn on. When everything is connected the way it should be, there is also a thermostat which comes into play in the circuit - unless the thermostat gives the "command" for cooling, the fans will not start up.
Wiki User
∙ 16y ago
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