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Q:

The Blower fan stops blowing when I accelerate. Why? Could it be a vacuum line? on 2004 Jeep Grand Cherokee

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This problem has accured since having the radiator replaced.
(2) Answers
Does the blower motor actually stop , or does the air switch to defrost/floor 'mode' (stops blowing through the dash vents) and then come back , when you let up on the throttle?