ra20001190020x

0020 - Switching points in cooling system Engine 119 in Models 124, 129, 140, and 210

Type ra · topic 20.00 · version 9604 · 1996-01-22

Applies to:

Where it sits

Function group 1 Engine › 20 Engine cooling system › 20.00 General

Also applies to engines/gearboxes: 119 960, 119 970, 119 971, 119 972, 119 974, 119 975, 119 980, 119 981, 119 982, 119 985

20-0020 Switching points in cooling system

Data

Models

124

129

140

210

Thermostat at coolant temperature ° C

Start of opening

Max. opening

78 - 82

94

78 - 82

94

78 - 82

94

78 - 82

94

Viscous fan coupling

cut-in at airflow

temperature °C

Safety
cutoff at
engine speed
fan speed
rpm

92 - 100

4500

3250

92 - 100

4500

3250

92 - 100

4500

3420

92 - 100

4500

3420

Electric auxiliary fan 2)

1st stage on/off

2nd stage on/off

3rd stage on/off

107/100

16/11

107/100

100/95

-

107/100

20/15

100/95

14/12

107/100 4)

17/14

115/107 4)

20/17

95/1153)

14/203)

A/C at coolant

temperature

in °C

Start of cycle 5)

Emergency off

121-123

126-128

121-123

126-128

121-123

126-128

121-123

126-128

System cap opens

at pressure in bar

or °C max.

1st stage

2nd stage

1.3 - 1.5

130 - 134

-

1.3 - 1.5

130 - 134

1.8 - 2.2

137 - 143

1.3 - 1.5 6)

130 - 134 6)

-

1.3 - 1.5

130 - 134

1.8 - 2.2

137 - 143

2) At coolant temperature in °C or refrigerant pressure in bar, 1st stage cuts in in line with vehicle speed: compressor
switched on

<40 km/h on
>70km/h off

3) Fully engaged

4) USA circuit. A/C off (EC button pressed), outside air>15°C. 2nd stage of this version operates at 107/100°C or 17/14 bar, respectively

5) Cycle: 50% ON period, 20 seconds on

20 seconds off

6) From outside temperature of >10°C

Referenced documents