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Old 12-30-2002, 03:29 PM
Posts: n/a
Question ACC mono valve '90 300e

Engine coolant temperature climbs to 120_C, heater blowing cold air. seems as if coolant finally starts to flow across heater core because heater will start blowing hot and engine coolant temp gauge to ~100_C. Temperature up and down from ~100-120_C. Suspect ACC mono valve. Would like to hear how hard a job to replace on my 1990 300E.
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