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#1
12-04-2016, 05:48 PM
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1978 280SLC (euro) with AC but no fan?
Hello everyone!
My first post here. I own a 1978 280SLC euro spec with factory AC (as per chassis number and codes), but the car has no auxiliary ac fan on the front of the condenser. Does anyone knows if this is correct? Thanks. 
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#2
12-04-2016, 05:52 PM
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If the car was expected to be used in the northern climes of Europe then yeah, this could be correct. If experience had shown it was not needed.
But if you are now driving the car in the southwest then you should add one. It is not hard. Just pick one up off or Ebay and bolt it in. They are also easy to wire in.
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#4
12-04-2016, 07:51 PM
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I had a 1981 280slc that had an aux fan. I now have a 1985 280sl that does not have an aux fan. The AC seems to work fine. If you don't top 100c on coolant temp, then it might not be necessary to add a fan. An aux fan is definitely needed if you top 100c.
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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#5
12-05-2016, 12:59 PM
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Quote:
It just all comes down to that temp gauge when deciding if one is necessary. But I would always want one anyway. Heat kills these cars engine areas in so many ways that if there is a way to disperse it then disperse it.
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#6
12-05-2016, 01:05 PM
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1978 280SLC (euro) with AC but no fan?
It would be interesting to know which option or destination would cause the car to get an aux fan or not. There is definitely wiring in the loom for the aux fan. It it not a separate chunk of wiring as far as I can tell, and my 280sl does not appear to have a plug for the fan.
I don't know if I've ever seen a v8 without an aux fan. There's certainly less room for cooling in the engine bay with v8 cars. Edit: my 280slc with an aux fan lived in northern Vermont the majority of its life, from when it was at most 4 years old. My 280sl lived primarily in the state of Delaware, not exactly northern or southern, and no aux fan. I don't recall where either was originally delivered.
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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#7
12-05-2016, 01:25 PM
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The auxiliary fan, although not strictly required, adds a significant amount of cooling when the A/C is engaged. It pulls air through the condensor when the vehicle is at rest and during lower speeds movement. This lowers the pressures of the circulating refrigerant, reduces the cabin temperature and aids in extending the life of the system.
The fan was a part of the dealer installed package and as such various versions and levels of "additional" items may have been installed depending on the dealer.
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#8
12-05-2016, 02:33 PM
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Thanks for all the replies.
So this is even more strange than I thought. I have a wire coming out of the compressor (York), that is not connected to anything. Could that be for the aux fan? (I'll upload a picture when I'm home) By the way, the car was originaly sold in Brazil, so it must have had an aux fan at some point...
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#10
12-05-2016, 06:17 PM
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Quote:
The connection for the aux fan is normally between the headlight and the radiator on the vertical support that goes between them. The two two prong plugs are held to the vertical support by a spring clip. The plug for the aux fan comes out of the main loom. So I believe that cars were either born with them, or not. The aux fan should kick on at 100 C when the single pile coolant temperature switch signals the 100 C. In some case, it might turn on when you turn on the AC, but it did not on my 1973 450sl which was totally stock. It only turned on when the car hit 100 C. Basically it had nothing to do with the AC. My 1978 450slc 5.0 is customized, but I believe the aux fan wiring is stock. I'm not sure, but I believe the fan comes on when I turn on the AC.
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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#11
12-05-2016, 06:54 PM
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If the car has been converted to f134a, then it must have an auxiliary fan, to be sure the condenser gets enough airflow at low speeds. I just wired it so the fan is on all the time when the compressor is on.
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Csaba 1972 280SEL 4.5, silver
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#12
12-06-2016, 08:47 AM
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The A/C receiver-dryer on the passenger-side firewall usually has a switch that actuates the auxiliary fan when the refrigerant reaches 62 degrees Celsius; a temperature switch in the cylinder head actuates the fan at 100 C.
I installed a manual switch in the center console seat-belt-warning slot to control the auxiliary fan in several of my 114 vehicles. If the fan is operating at highway speed it actually reduces cooling performance by interfering with ram-effect cooling Tim Kraakevik kraakevik@voyager.net
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