Last night I drove home (highway for 10 minutes, then slower traffic10 min). Parking car I noticed temp way up around 100.
turned it off. top rad hose was hot, lower seemed cold or mildly warm. Could this be faulty thermostat or a clogged rad?or something else?

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1987 190E 2.3L (Daily Driver)
1985 VW Scirocco (Mint-Summer)