If the engine's temperature is shooting beyond ideal level, you should check your Lexus Ls400 water pump for defects. The water pump runs through a belt and relies on centrifugal force in able to circulate coolant throughout the compartment to help keep the car engine cool. On a really hot day or when caught up in a traffic jam, your car may get too hot easily and the interior may not be ventilated accordingly.
A squeaking sound is normally your hint to a busted Lexus Ls400 water pump that must be fixed. The weep hole of the pump is sealed using a gasket, so if it's busted, coolant will surely drip. If the water pump's bearing, gasket, or the pump itself conks out, you should avoid driving your vehicle until this is fixed (unless you it's all right for you to risk engine overheating). To prevent the automotive engine from overheating, it is highly recommended that you fix the broken gasket of your water pump or change the entire unit for your own benefit. You'd better get a topnotch stock replacement that is uniquely tailored for your car's cooling assembly for custom fit and highly reliable performance.
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