patriciafrost53
Lexus GS Overheating Radiator Fan Noise
Summary of the thread
A 2007 Lexus GS is experiencing engine overheating and a check engine light, with unusual radiator fan noises. The problem may stem from a cooling system issue, potentially involving the radiator fan or a faulty thermal switch. It is suggested to inspect the fan blades and consider the possibility of a defective speed sensor controlling the fan. Professional diagnosis and repair are recommended to avoid further complications.
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4 comment(s)
patriciafrost53 (community.author)
Thanks! I had a quick look at the fan blades, they seem okay, not broken or anything. How would I test the thermal switch? Is that something I can do myself?
konstantinweber1
Testing the thermal switch can be a bit tricky without the right tools. You'd need to check for continuity with a multimeter when the engine reaches a certain temperature. However, given the age of your Lexus and the symptoms you're describing, it's likely the speed sensor defective that controls the radiator fan is faulty. I suggest taking it to a workshop to confirm, you might end up doing more harm than good trying to fix this yourself. Expect around 250€ for the repair.
patriciafrost53 (community.author)
Yeah, you're probably right. I'll take it to a mechanic. Thanks for the advice, appreciate it!
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LEXUS
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GS
konstantinweber1
Overheating and check engine light, plus fan noise… sounds like it could be a cooling system issue, potentially related to the radiator fan. Have you checked the fan blades themselves? Are they spinning freely? Also, has the fan speed changed, or is it running constantly, even when the engine is cold? It could also be a faulty thermal switch that isn't telling the fan to kick on when it needs to.