Repair Manual

19
COOLING - EXHAUST - FUEL TANK
19 - 9
NOTE: The GMV thermocouple may not be repaired ;I t is located on the radiator.
The G.M.V. thermocouple is located on the lateral right side of the radiator, attached on this.
The tightening moment is 5 daNm.
It has a double purpose:
- it controls the engine cooling G.M.V. starting ,by means of a relay, when the temperature
of the cooling fluid reaches to 95° C ( stage I ) and its stopping, when the temperature is
lowering under 90° C.
- it controls the uncoupling of the AC compressor if the cooling fluid temperature reaches until
to 105° C ( stage II )and permits its coupling when the temperature is lowering under 100° C.
The thermocouple operation is performed in two stages of temperature, as follow:
-stage I ( between the posts B and A) - coupling at 95° C and uncoupling at 90° C.
-stage II ( between the posts ( B and C )- coupling at 105° C and uncoupling at 100° C.
In order to check the correct operation of the thermocouple, there are necessary the followings:
-a battery (1);
-a cooling fluid vessel (2);
-a thermometer for fluids between 0 – 200° C (3);
-a control lamp (4);
- a heat source.
Make an assembly according to the a.m. diagram.
Heat the fluid in the vessel.
When the liquid temperature reaches to 95 C the lamp , connected between the posts B and
A of the thermocouple should light up and shall remain so, until the temperature is lowering under
90° C.
If the lamp does not light up at the coupling temperature or it remains lit also after the temperature
lowering, under the uncoupling temperature, replace the thermocouple. Then connect
the lamp at the posts B and C of thermocouple ; it should light up when the cooling fluid reaches
to 105° C and it remains lit until the temperature is lowering under 100° C. Contrary, replace the
thermocouple.
14
2
3
COOLING G.M.V. THERMOCOUPLE CHECKING
( for Pick-Up with C.A. )
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