1972 Mercedes 280se Heater Question - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 11-07-2014, 06:03 PM Thread Starter
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1972 Mercedes 280se Heater Question

I've got a 72 280se six cylinder and while the heater does work I don't know if it's working as good as it should. It warms up the car but it seems to take a while. Not what I would call toasty. The engine water temp runs about 175 on the gauge. The heater valves seem to be good. I don't see any leaks. I
Any suggestions
Thanks,
lorirobin
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post #2 of 11 (permalink) Old 11-07-2014, 11:48 PM
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I would try flushing the whole system. Maybe there's an airlock or blockage of some kind?
Cheers John.
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post #3 of 11 (permalink) Old 11-08-2014, 06:43 AM
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Just because the levers move doesn't mean the heater valves are working. It takes a bit of neck bending, but you can look up under right side of dash to heater core and verify that the valves are actually moving. They get stuck and the wire from the lever breaks.

Can you pls verify that the valves are working?

If you have to remove and clean them, there are 2 special o rings required.
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post #4 of 11 (permalink) Old 11-08-2014, 09:24 AM Thread Starter
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Yes, the valves are working. I took out the ash tray and can see the valves operating. The levers were changed not too long ago and I did notice the 'drivers' side valve isn't moving from side to side as much
as the other valve. I may not be opening fully. I think I need to adjust the lever. But I am getting warm air on both sides. Even though the one valve isn't opening as much as the other I can't say I notice much
difference in the level of heat. I live in California, the heat is just OK but if the weather was truly cold, I don't think it would be.
Thanks for any suggestions.
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post #5 of 11 (permalink) Old 11-08-2014, 01:26 PM Thread Starter
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This morning I took the radiator cap off and let the engine run a bit. I don't know what I thought it would do, maybe there was some blockage, air gap I don't know. But, it does seem to be quite a bit warmer.
Didn't notice any air escaping or any bubbles coming from the radiator.
By the time I got around to doing this, the day had warmed up some. Tomorrow while it's still chilly outside, I'll test it again.
As I said before, I don't know what I thought it would do but it does seem better/warmer. Could this of done something?
Thanks
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post #6 of 11 (permalink) Old 11-08-2014, 05:20 PM Thread Starter
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The only other thing I can ad is I may have the wrong radiator cap. From what I can find, my engine, a 6 cylinder, should have a 120 and I have a 140. Now what difference this may make, I have no idea. Don't know if this would affect the heater. Maybe someone out there knows a lot more about this than I do.
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post #7 of 11 (permalink) Old 11-09-2014, 07:30 AM
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Radiator cap shouldn't make a difference. Pressure in the system is irrelevant to flow through the heater core.

Check that one valve you think isn't opening up all the way. The valves don't have a lot of clearance internally, so if it's not 100% open you're restricting flow.

Dan
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post #8 of 11 (permalink) Old 11-09-2014, 07:57 AM
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Is the fan working? Even with the fan, the heaters in these cars are not very toasty.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #9 of 11 (permalink) Old 11-09-2014, 08:07 AM
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Worthwhile to descale the system , old and likely to have scale build up over the decades.
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post #10 of 11 (permalink) Old 11-09-2014, 11:55 AM Thread Starter
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Yes, the fan is working. All three speeds. The radiator was recored not long ago, so it should be in good shape. I'll see about adjusting that one valve. But as you probably know, they ain't easy to get to.
More info tomorrow. I'm going to see what temperatures I'm getting with an instant read thermometer.
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