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all about fans .... Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Sat, 20 Apr 2002 15:45:57 In Reply to: Cooling fan question for all & KevinK, Mitch, Sat, 20 Apr 2002 12:20:20 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Your drives side fan has a problem .. related info I put together:
All USA C900 FANS (2.1L na exceptions noted)
RAD_FAN ..... passenger side ... fuse #25 M84+
AC_FAN ...... driver side ...... fuse #6 M84+
fan-switch .. top of radiator, driver's side
IN SHORT:
* With hot rad, fan-switch closes and both fans come on (only rad fan, 2.1L).
* Run AC, both fans run, and the 'rad' fan will cycle on and off with the compressor.
AC MODE DETAILS:
With AC button on, AC FAN relay (155) turns on AC_FAN full time, powered by fuse #6. Normally, the compressor will cycle off, based on near freeze-up sensed in the cold coil. If this sensor is happy, the compressor relay (156) kicks compressor back on, and also provides an isolated bypass to the stuff that normally turns the RAD_FAN on. So, AC borrows the RAD_FAN, powered by fuse #25, whenever the compressor has cycled on. If both fans run full time, the cold coil is NOT getting too cold, or there is a fault.
RAD COOLING DETAILS:
With hot rad, fan-switch closes, allows voltage to RAD_FAN, from fuse #25. A wire, connected to the RAD_FAN feed wire, also allows voltage to go to an isolated trigger at the AC_FAN relay (except 2.1L). This relay turns on the AC_FAN (as in AC mode), powered by fuse #6.
QUICK TESTS: engine off
1) RAD_FAN, Connect 2 wires to the fan switch together. Key off, RAD_FAN is on, except no fan runs for M84-90 with delay relays. Key on, BOTH fans run, all years (RAD_FAN only for 2.1L).
2) AC_FAN, Turn cabin fan on, ac button on. Key off, no fans. Key on, if freon is loaded, AC_FAN comes on all years. For M81-83, AC_FAN only. For M84-85, both fans run?. Not sure if both run with later models.
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For DIY repairs, the Bentley manual is a mandatory tool.
posted by 67.208.17...
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