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A couple of more checks for the 964: First, see if the seller has any information regarding the clutch and dual mass flywheel. The original DMF that Porsche used in the 964 didn't hold up very well, so Porsche switched suppliers. My own 964 had the original DMF fail at 50,000 miles. Second, a kit was retrofitted to most all 964 's that blew a little bit of fresh air into the distributor to clear out any ozone that might be building up. Ozone attacks the rubber distributor belt, so this fix is important to see if it is in place. You can easily see if there is a small clear flexible tube going into the distributor from the duct coming out of the heating/cooling fan. There also may be a second tube that connects to the central reflector to keep condensation out. I would also want to see if the seller had any documentation regarding when the distributor belt was last changed (if ever). One another check is the rubber "boot" that attaches to the back side of the fan housing and connects to the inlet for the heating/cooling blower. The rubber will eventually harden on this part from engine compartment heat and it can crack and disintegrate. When it fails, a whole lot of cooling air will escape through the hole instead of going through the cooling fins of the heads and cylinders.
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