Question about 1999 Lexus Gs 300
Most likely a bad heater core. It's behind/under the dash. There should be two hoses that go into the firewall under the hood. These carry and return warm coolant to the heater core. The blower motor blows across the heater core and pushes the warm air into your car. Try feeling the carpet under the dash on the passenger side. See if it's damp. Many times if the core starts leaking, your carpet will be damp over there. I've also seen them completely plugged up with dust/dirt/debris/insects, so the air wouldn't flow through it from the fan.
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
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