Question about 1992 Lexus Ls 400

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Lexus heater blows cold

The heater on my 92 ls400 only blows cold. I have replaced the thermostat and made sure the coolant was full but it still blows cold no matter what. Any ideas?

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You could have a blocked heater core. Check for two heater hoses running into the firewall in the back of your engine. They should be together and about 5/8" in diaameter. If one is hot and the other is cooler then your heater core is blocked. Unhook both hoses and use a garden hose to back flush. Be sure to catch the coolant and dispose of it properly.

Posted on Mar 21, 2009

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