Ok 94 ls 120,000. Stock h20 pump

Problem her car over heats in traffic but not in the driveway.

I recently replace the thermo stat and radiator.

I can leave her car in the driveway with the AC on for like a hour and it dosnet over head, both fans come on ect.

But as soon as she gets on the freeway in trafic it gets hot? any ideas?

 

sound like water pump, at idle it could be working fine, but once in higher revs the dying pump might not be able to pump good

 

Most likely a water pump, but could be possible head gasket failure.....