740 L4-2.3L SOHC VIN 88 B230F (1985)
Measure the coolant mixture. The anti-freeze concentration must be 50 percent; equal to a freezing point of -35 to -50~C (-31 to -58~F). Use for
example coolant tester (P/N 9985011-7).
NOTE:
ONLY VOLVO ANTI-FREEZE TYPE "C" IS ACCEPTABLE
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Pressure Check
The pressure tester and pressure gauge (9995230-1) must be connected with a T-connection into the hose between the expansion tank and the
radiator (as illustrated). The gauge on the pressure tester is not accurate enough to detect small leaks.
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).