ENGINE 1.3L QUADRAJET (90PS)
67
OPERATING TEMERATURE CIRCUIT
When the coolant temperature goes above 88 +/- 2
0
C, the thermostat starts opening and the coolant is
directed towards the radiator.
The radiator causes the coolant temperature to drop
significantly. This cooled coolant is then again is
directed towards pump for recirculation.
EGR AND HVAC RADIATOR CIRCUIT
A part of the coolant coming out from the cylinder
block is directed towards the EGR heat exchanger,
where it absorbs the heat from the exhaust gases
before it mixes with the fresh air. This hot coolant is
then circulated to the HVAC radiator where it transfers
the heat to the heating coil. Now the cooled coolant
is directed towards pump for recirculation.
3A.1.3. ENGINE COOLING
1. Water pump
6. Supply reservoir
2. Engine coolant temperature sensor
7. Engine oil heat exchanger
3. Thermostat
8. HVAC heater pipes
4. Radiator
9. E.G.R. exhaust gas heat exchanger
5. Fan
10. Water recirculation pipe
A. SYSTEM DESCRIPTION
In 1.3 QUADRAJET 75ps engine the Engine Cooling
System also includes HVAC heater coil radiator and
EGR heat exchanger in addition to other conventional
components.
COLD AND WARM UP CONDITION CIRCUIT
During the engine cold start and during the
subsequent warm up process (i.e. when the coolant
temperature is below 88 +/- 2
0
C), the coolant from
the cylinder block is directed towards the Thermostat
and since the thermostat is closed, the coolant takes
the by-pass circuit and is directed towards the pump
from where it will be re circulated till the cut-off
temperature is reached.