240 L4-2.3L SOHC VIN 88 B230F (1986)
Temperature Gauge: All Technical Service Bulletins
Coolant Temperature Gauge - False Hot Reading
MODEL
200
GROUP
38
NUMBER
203
MARKET
US and Canada
DATE
December 1993
TITLE
COOLANT TEMPERATURE GAUGE - FALSE READING 2401986-->
REFERENCE: TP 31486/1 (ENGLISH); 4/90; LIGHTING, INSTRUMENTATION AND OTHER ELECTRICAL EQUIPMENT
COOLANT TEMPERATURE GAUGE - FALSE READING
Oxidation may occur on the temperature compensator pins (compensator located on combined instrument printed circuit board). This may cause
temperature gauge readings to be too high which can cause the indicator needle to move closer to or enter the red area. The engine may overheat due to
faulty timing, a fault in the cooling system, etc., which should be remedied first.
If there are customer complaints about the temperature needle intermittently entering the red area and there are no problems with the cooling system,
check the temperature gauge using a test resistor in accordance with Service Manual pages 53 and 54.
If the test measurement with the test resistor shows a fault in the circuit use the following procedure.
METHOD FOR CLEANING AND LUBRICATING CONTACTS AND CONTACT PINS ON THE TEMPERATURE COMPENSATOR.
A1
Remove combination instrument
(see Service Manual, page 50, M2).
A2
Remove the 7 screws holding the printed circuit board to instrument housing and separate the two parts.
A3
Remove temperature compensator (# 1 in illustration), carefully pull straight out. Take care not to break retaining tabs on each side of board.
