1980 280CE Summer Project - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 06-19-2017, 10:07 AM Thread Starter
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Vehicle: 1980 280CE, 2010 E350 4Matic
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1980 280CE Summer Project

After two years of sitting parked, I'm preparing to dive into my 1980 280CE that I scooped out of the Chicago ghetto. I'm also need to solve, first and foremost, the overheating issues that I was having that led to it being parked for two years in the first place. Several replacement fan clutches made no difference to the engine temperature, which would steadily rise, especially in stop-and-go traffic, and not go back down. Playing with the thermostat also made no difference.

Would new aftermarket radiator be a sensible route to follow? I'm also thinking about just ditching the archaic clutch cooling fan and just doing electric fan modification somehow.

Want to get this beauty back on the road!

http://imgur.com/zV6nhCN
http://imgur.com/jt5FMYh

Blasts from the past:
https://www.benzworld.org/forums/w123...ting-woes.html
https://www.benzworld.org/forums/w123...lattering.html

Last edited by PrussianMauser; 06-19-2017 at 10:11 AM.
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post #2 of 10 (permalink) Old 06-19-2017, 03:01 PM
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The water pump impellers are know to erode thus reducing coolant circulation, if you haven't replaced it yet I'd start there.
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post #3 of 10 (permalink) Old 06-19-2017, 08:20 PM Thread Starter
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OK! Good to know, I will have to pull the water pump and have a look inside while I'm at it.
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post #4 of 10 (permalink) Old 06-19-2017, 08:27 PM
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Buy a Graf brand water pump or you'll be in there again within a year or two.
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post #5 of 10 (permalink) Old 06-25-2017, 05:49 PM Thread Starter
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Buy a Graf brand water pump or you'll be in there again within a year or two.
OK great, noted!
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post #6 of 10 (permalink) Old 07-02-2018, 12:15 PM Thread Starter
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OK great, noted!
Holey Update! OK, so (a year after my last update ) my girlfriend's brother gave me a big hand in helping to change the water pump. The impellers didn't look too bad and the running temperature still tends to settle at between 100 and 120, but hasn't set off the overheat light. In other words, not a ton has changed. Would changing the radiator be the next logical step? Also, the AC condenser and electric fan that sat in front of everything have both been removed as the fan didn't work and they were both just impeding air flow.
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post #7 of 10 (permalink) Old 07-02-2018, 02:49 PM
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The aux.pusher fan was activated by a temperature switch on the a/c dryer, you could try re connecting the fan, jumper the two wires at the dryer then turn the ignition to the run position with the either the defrost or hi/lo buttons pushed, this should show you if the aux fan works. From there you could wire in a manual toggle switch in the cabin to the temperature switch leads and have a manually operated aux cooling fan. Even if the stock fan is shot you can wire in a new after market fan in to replace it, in fact I replaced the stock one on my 85 with a new 10" high speed pusher this morning.
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post #8 of 10 (permalink) Old 07-02-2018, 03:52 PM
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Use a thermometer laser gun and acquire temperature readings in different areas on the front of the radiator. If temps vary then the radiator needs to be replaced.

Be prepared to spring for a new expansion tank as well. Once the water pump and radiator have been replaced the system will be properly pressurized and cause the expansion tank to leak at some point if it’s very dated.
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post #9 of 10 (permalink) Old 07-08-2018, 08:28 AM Thread Starter
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Use a thermometer laser gun and acquire temperature readings in different areas on the front of the radiator. If temps vary then the radiator needs to be replaced.

Be prepared to spring for a new expansion tank as well. Once the water pump and radiator have been replaced the system will be properly pressurized and cause the expansion tank to leak at some point if its very dated.
That's a good tip to shoot the temperature of different areas on the radiator, thanks! Believe it or not, my 280CE doesn't have a expansion tank at all, just a rubber tube that routes overflow straight out onto the ground.
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post #10 of 10 (permalink) Old 07-08-2018, 08:35 AM
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My 240D W124 was running hot. Using his hand, my then mechanic found a cool/cold spot in the lower middle of the radiator. Installed new radiator and problem fixed.
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