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Q: Timing belt housing gasket on 1998 Chevrolet Monte Carlo

I just had my head gaskets replaced, thermostat and radiator cap replaced. 10 days later I saw my coolant dripping out from the left front and the shop showed me where the drip was coming from. Before the head gasket job I didn't have any coolant leaks. It is now leaking from what I think they said, the timing belt housing and needs a new gasket. They want $390 to do this and suggested I replace the water pump while they were in there for another $90. My question is, what made the timing belt housing unit blow its gasket after they put new head gaskets on, did a valve job, resurfaced the heads and drained and refilled my coolant. Is this something they deliberately caused to make me come back?
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This is a tough one. It's hard to know what the condition of the gasket was at the time of the head gasket job. You wouldn't want a shop to recommend every possible gasket that could one day start leaking but you do want them to replace any gaskets that may be affected by the head gasket repair. I can't say which this is without seeing the vehicle, so sinautoscan may be correct, and maybe he has experience with this engine. They at lease should give you a very good discount, and it may be worth the effort to get a second opinion about the leak to see if it should have been recommended with the head gasket job, or if it may have been caused by the repair.
Good Luck, let us know what happens!
if you got a head job they should had suggested to change the gasket even the water in good faith this is something they should have done.
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