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On a bosch CIS or CIS E fuel injection system there is a thermal time switch located on the engine upper radiator coolant hos at the head. This device controls the cold start injector timedto engine temperature, cold engine up to about 10 seconds of injection, hot engine 1 or 2 seconds of injection. This switch is used on many European models (VW, MB, etc.) Since you did not provide a make, year and model of the vehicle this is only a guess.
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95 sunfire overheating The only way to get the rad fan on is to turn on the air conditioner?
Thermal Relay is defective.Thermal Relay is defective.
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110% of the rated current.
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Why doesn't a 1989 Honda Accord radiator fan come on except with the AC on?
Check the thermal relay.
