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

This problem has accured since having the radiator replaced.

Asked by for the 2004 Jeep Grand Cherokee
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?
1 more answer
i would doubt it is vacuum related