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968 running hot at speed?

  • 1994
  • 968 Cabriolet
Mileage: 
34 000
Engine
Sonora, 
California

The recent Zone 7 food drive was the first time I've had my 94 968 Cabriolet Tiptronic out for an extended highway drive in warm weather. On earlier drives, the temp gauge settled at about the 9 o'clock position regardless of engine speed. Ambient temp was 18 C or less. During the drive last weekend, with ambient temp pushing 30 C, the gauge rose to 11 o'clock, just a hair below the "red" zone, while cruising between 65 and 75 mph. Slowing down to 55 or less lowered the pointer to 10 o'clock. I checked under the hood when we arrived home; the engine didn't appear hotter than normal coolant was the circulating normally with no venting from the recovery tank and the fans appeared to be operating correctly. The 968 ran and shifted normally during the drive, and the engine used no oil or coolant. Unfortunately, my IR thermometer was DOA so I wasn't able to get hose temps.

Is there anything particular to the 968 that I should check?

The timing and counterbalance belts, tensioners, water pump and thermostat were replaced less than 500 miles ago.

Thank you in advance for any insight you can provide.

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