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  1. If you see coolant Inside the vehicle on the passenger side, The Heater Core would be the problem.
  2. If the leak is out side and you see a puddle on the ground below the engine from the passenger side, It can be a Water pump, Heater hose, Over flow from the Reservoir tank, or an intake manifold gasket.
  3. If the leak is more underneath the vehicle on the passenger side, It might be a Heater Hose and/or Heater Pipe which supplies the rear heater with coolant (if the vehicle is equipped with rear heat) .
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Q: Why is the 99 venture leaking coolant on the passenger side?
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