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Old 07-16-2003, 06:14 AM
rolls royce
Posts: n/a
no aux cooling fan

hi all 1986 2.3 16v no cooling fan have checked fuse ok i have 3 sensors on the thermostat housing which one (if any ) controls the fan. before i put power.through the one on the right appears? to be the heater gauge. the one in the middle has 2 wires.( me thinks ) one in for low temp . one out for high temp. one on the left(no idea) oh it is non air con.(as i live in england/??)car was on the ramps yesterday having laser tracking and it went to 120 degrees (ouch) regards ken
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Old 07-16-2003, 11:56 AM
Registered User
Join Date: Dec 2002
Location: Suburban NYC
Posts: 57
Have you checked the fan itself by applying 12 volts directly to it?
Is there a separate fan relay? I have one on my 123. When my fan went flakey I merely jumpered it so it runs when the key is turned on. Other owners wire their aux fans into the a/c compressor clutch circuit so it comes onb when the a/c kicks in.
There may two switches on your receiver-dryer. One with a pigtail (on the 123) controls the fan. If the fan starts when you jump those connections, look into the a/c system. Some mechanics replace the pressure-operated fan switch with a temperature operated switch.
But jumpering is a small sacrifice to avoid an overheating problem. On a long trip it has saved me much grief.
If your model has a Kilma board, see other posts on this site for specific Klima suggestions.
Stage Wizards Lighting and sound designer
1981 SD 328,000
1985 300TD, 266,000
1984 300 TD, 267,000
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Old 07-16-2003, 04:19 PM
rolls royce
Posts: n/a
no aux cooling

thanks for the reply but you missed the point my merc has no air con. i would like to know which of the 3 outputs is the aux controller before i start putting 12 volts through them
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