Kinda weird........ never had this happen before. [Archive] - Toyota MR2 Message Board

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So I started my car today and while I was waiting for it to warm up, the temp gauge shot straight to normal temp, then kinda bounced around between half way and quarter of the way and there was this weird rattling sound coming from the engine bay, so I revd to around 2k RPM and sat like that for about 1 minute, and let off the gas, then the tach sat and hopped between 1,250 RPM and 1,750 RPM. So I kicked it up to 2,500k RPM and turned on my heater then the temp gauge dropped to quater of the