Temperature Gauge - Not Functioning Correctly: Overview
90ford36 Article No. 90-23-10GAUGE - TEMPERATURE - INOPERATIVE - 3.8L SUPERCHARGED ENGINES
FORD: 1989-91 THUNDERBIRD
LINCOLN-MERCURY: 1989-91 COUGAR
ISSUE: The temperature gauge may be inoperative or not functioning correctly, This occurs because the coolant temperature sender assembly is improperly grounded or damaged.
ACTION: Check to see if the coolant temperature sender is damaged or not properly grounded. If necessary, replace the sender assembly (10884). Refer to the following procedure for service details.