740 L4-2.3L SOHC VIN 88 B230F (1985)
Tighten expansion tank cap. Increase the pressure until the relief valve in the cap opens.
OPENING PRESSURE:
Black cap, marked 75 kpa = 65- 85 kpa ( 9.4 - 12.3 PSI)
Grey cap, marked 150 kpa = 145-155 kpa (21.0 - 22.5 PSI)
To leak test the cooling system, apply pressure at 60 kpa (8.7 PSI). Maximum allowed pressure drop is 3 kpa (0.4 PSI) in three minutes.
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Air Guide
Make sure the air guide in the spoiler is properly installed.
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A/C Condensor, Intercooler and Radiator
Check that the A/C condensor, intercooler and radiator are free from foreign objects. Make sure that the vertical sealing strips on the A/C condensor
are in position. If loose, they should be glued back in position.
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Cooling Fan
Check cooling fan type and function. The fan clutch should increase the fan speed when it is exposed to an air temperature of 65 - 85~C
(149-185~F).
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Electrical Cooling Fan
Check the function by connecting the two wires at the thermal switch located in the lower radiator hose. Ignition ON. The fan should start and rotate
counter-clockwise as viewed from the front (as illustrated).
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Ignition Timing
Correct timing is 12 + 2~ BTDC at 750 rpm. Make sure that the ignition is advanced to approximately 25~ when the electrical cooling fan starts (see
Service Manual TP 30684/1 760 Turbo, Group 26 Page 59).
2.
UPGRADING, B230FT WITH AUTOMATIC TRANSMISSION
If the temperature gauge is reading high, or the engine overheats during extended idle and/or in stop-and-go city traffic, the following upgrading can
be carried out:
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Radiator
The radiator core on the B230FT is made of aluminum. For improved cooling capacity at idle, a radiator with copper core is available under P/N
1266053-6. The copper core radiator was introduced in production from VIN 704-110188
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Electrical Cooling Fan Switch