TEMPERATURE GAUGE QUICK-CHECK
A quick-check of the coolant temperature sender can be made to determine the cause of an incorrectly reading temperature gauge. The checks should be made at the coolant temperature sender on the front of the cylinder head, below the distributor. (Scheme 4)
Disconnect the wire from the sender and hold it to ground. Turn the ignition on. If the gauge needle moves upward, the sending unit is faulty. If the gauge does not respond, the wiring to the gauge is broken (open circuit) or the gauge itself is faulty. To check the resistance of the sender, measure between ground and the sender terminal with the wire disconnected. See COOLING SYSTEM SPECIFICATIONS .
Note. When replacing a faulty coolant temperature sender, drain the cooling system below the level of the sender and then unscrew the sender.
Scheme 4
THERMOSTAT QUICK-CHECK
To quickly check if the thermostat is opening and if coolant is circulating through the radiator, allow a cold engine to reach operating temperature (temperature gauge needle approximately centered). Feel the radiator hoses. If the hoses are hot to the touch, the coolant is circulating. If the hoses are not hot, coolant flow to the radiator is restricted. Check for a faulty thermostat or a plugged radiator.
| Application | Specification | |
|---|---|---|
| Coolant Type | Phosphate-free 50% mixture anti-freeze 50% water | |
| Coolant Replacement Interval | (1) 30,000 Miles | |
| Permissible Coolant Leakage | 1 qt. over 60,000 miles (1 liter/100,000 km) | |
| Coolant Temperature Sender Resistance at 90°C (194°F) | 46.9-55.5 ohms | |
| Coolant Thermoswitch | ||
| Closing Temperature | 194-203°F (90-95°C) | |
| Opening Temperature | 185-194°F (85-90°C) | |
| Cooling System Capacity | ||
| 900 Model | 10 liters (10.5 qts.) | |
| 9000 Model | 8.65 liters (9.10 qts.) | |
| Cooling System Test Pressure | (2) 0.9-1.2 bar (13.0-17.4) | |
| (1) Interval is for first service. Change every 15,000 miles thereafter. (2) Expansion tank relief valve will open in this range. | ||
| (1) | Interval is for first service. Change every 15,000 miles thereafter. |
| (2) | Expansion tank relief valve will open in this range. |
COOLING SYSTEM SPECIFICATIONS