2003 Santa Fe, how much is a fair price to replace timing belt and required service.Just don't trust dealers.Car has 18k on the engine.Was previously quote about $750.

What area are you in? My mechanic is getting ready to replace my timing belt on my 03 Santa Fe and said it would be $325. He said they used to switch out the water pump while they are doing the timing belt but Hyundai no longer recommends replacing the water pump unless its leaking. If he gets into it and the waterpump is leaking it will be an additional $120.

What are the parts they want to replace in addtition to the timing belt? water pump maybe? let me know.

That sounds like a good deal.
You have to figure out the labor - as it is different in each part of the country/world.
My estimate guideline says approximately 6 hours start to finish.
@ $110.00 per hour (dealer labor here) that's $660 just for labor.
Parts are minimal - under $100 if you only have the belt to replace.
I would suggest replacing the tensioner pulley while it's all apart.

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We just had our timing belt changed out but our car has 79k miles on it it sounds like theyre pulling a fast one on you. try to find a private mechanic and get a second opinion!!!