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Question:

Chevy hhr water pump replaced and came back with more problems.?

First the shop put in a heater core, but it was still leaking and overheating. Next they put in a water pump. Went to get it and now it wines really loud and the engine use to purr like a kitten, couldn't even tell it was running, now the engine shakes the whole car and it died one the way home but started again. The shop said the cam positioning needs reset again and on the way back to the shop it died again. So from leaking anti-freeze to now it vibrates, dies and wines really loud ! Any ideas what they did wrong ?

Answer:

Matbe they forgot to replace water pump gasket, timing belt not aligned with timing of engine.
Yea, this engine has the water pump that is driven off of the timing Chain, before removing the pump you have to install a holding tool to keep the timing gears synchronized, If the pump is removed first without installing the tool, the camshaft timing will be out of sync. and that's what probably happened. NOTE: This sounds like an unqualified shop to work on vehicles, if they can't trace a coolant leak! The first thing that should have been done is a CO2 test on the cooling system to see if the vehicle has any hidden head gasket issues. (Good luck)

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