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Climate Control Fan Control

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I have a '99 GS300 with about 160k miles. It continues to run great but at this age things are starting to fail.

My current issue is the climate control fan. It will pick a speed and I can no longer vary the speed. It will kick on low and no matter what I do I can't increase the speed, or as it did this morning, it kicked on high blowing cold air while I waited for the engine to warm up. At least once the engine warmed it blew warm air, but I can see this is going to be a major problem come summer.

I'm looking for some advice on how to troubleshoot this myself.


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