Fan not kicking in - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

 
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#1 Old 01-25-2014
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Fan not kicking in

Hello everyone

Have had our Slk for a couple of months now and so far everything has been ok, but today left it idling while cleaning it and noticed it was steaming and had overheated, so looked and noticed the fan had not kicked in,so took it out for a run and it ran at normal temp, had a search through here and read some posts and first port of call in the morning is to wire the fan straight to the battery and check thats working, but know it could be the fan control module or the fuse, any hints on checking if these are working or not and if there is anything else it could be?
Thamks I advance
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#2 Old 01-25-2014
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Originally Posted by spudboy74 View Post
Hello everyone

Have had our Slk for a couple of months now and so far everything has been ok, but today left it idling while cleaning it and noticed it was steaming and had overheated, so looked and noticed the fan had not kicked in,so took it out for a run and it ran at normal temp, had a search through here and read some posts and first port of call in the morning is to wire the fan straight to the battery and check thats working, but know it could be the fan control module or the fuse, any hints on checking if these are working or not and if there is anything else it could be?
Thamks I advance
You're right about the causes. First, directly connect fan to the battery and see if it works. If it does, then try checking fuses. If I'm not mistaken fan fuse can be located in a small box near the battery and washer neck. The lid simply pops up and you will see 4 "unusual" fuses (not regular ones) with cables attached and secured by the bolts. There should be a diagram on the inside of the lid saying which one is which. Locate the one for the fan and undo the bolt, check if the fuse is not blown. Next step would be your fan relay. But I have no idea on how to check that...
Let us know how it goes!
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#3 Old 01-25-2014
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#4 Old 01-25-2014
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not sure on a 170 but most cars have a thermal switch either on the radiator or the thermostat housing if you pull the connection of there will be 2 connections just put a wire across them with the ignition on if the fan kicks in its the switch that's faulty its the usual suspect
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#5 Old 01-26-2014
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Update

Just had a look at the car,hooked fan to the battery,worked fine so looked in the fuse box just in front of the battery and checked with a meter the fuse that runs the fan was not putting 12v across took it off and it had blown! So hopefully need to replace that and away we go, any idea where i can get one from? Or is it best just to get from my local main dealer,can't be that much......
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#6 Old 01-26-2014
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Just a side thought, tho replacing the fuse will fix it is there anything i should be looking for to why it's gone in the first place,or is it just one of those things?
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#7 Old 01-26-2014
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Does the fan spin up and slow down freely when jumping it with a wire directly from the battery? If not, check the bearings/bushings within the fan motor. Also, is there any binding when you turn the fan by hand? Beyond that I don't know what would be causing an excessive load on the fuse other that a short to ground somewhere.

I keep an old ammeter (-30 to 0 to +30 amps) from an old British car that I use to check the loads on circuits. If the load is more than 1/2 the fuse rating, you may have problems keeping the fuse from blowing due to the heavy start-up load of the motor. You may want to try something like my old meter to see what the load is. I don't use my multi-meter for that purpose because the rating on it is only 10 amps and the internal fuse is about $12 to replace if it is put in a circuit with a heavier load or a dead short.
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