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Water Pump 92 Ls400


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My daughter's boyfreind has a 92 LS400 and water is shooting out of the top of the water pump. I have read through the forums, and it seems as though everyone talks about changing the timing belt and water pump at the same time. Is that required? I enjoy working on cars and have changed several water pumps, but I have never worked on a Lexus. And I cannot find a Chiltons or Haynes for this car. I want to try and save him some money, but don't want to get it torn apart and run into something that we have to get it towed and end up costing him more than if he had taken it to the shop in the first place. Is changing the water pump pretty straight forward, or is there some things that are tricky and require experience working on a Lexus. Also, he said his temp gauge is not working. I saw what looks like the temp sensor on top of the thermostat housing. It has two vaccum hose fittings that are broke. Is that the sending unit? If so, which hose goes on top and which one on the bottom. The vaccum hoses are there and plugged with screws. I appreciate any advice that anyone can provide. Thanks much.


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