I had this same problem on my '99 Tip and went through three water pumps, new coolant and new V belts until a coolant bypass valve, attached to the transmission and originally a 924 part, failed. Apparently it had been leaking for years but not enough to drip on the floor. After it was replaced my temp stays on the left side of the eight. Don't know if this part is for Tips only but suspect it has something to do with trans cooling.
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