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85 300d Heater troubleshooting help
Hello everyone, I have an 85 300d that doesn't like to blow hot air anymore especially at high speeds. I am wondering how I should go about troubleshooting this problem. I think It could be a clogged up heater core or a valve problem. Should I try to bypass the valves before I try to flush?
thanks Last edited by Alexreed300d; 02-11-2021 at 05:03 PM. |
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No heat at high rpm means a failed monovalve
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I'll try to bypass that first then
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You will get constant high heat which may be a good idea at this time of the year
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May as well just replace you monovalve insert. No heat at highway speeds is a sure sign of a torn diaphragm.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
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Sounds like I will either replace or bypass that mono valve ill let you all know what happens after I do it.
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I can let you know what is going to happen if you bypass the monovalve; you are going to have more heat than you can stand.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
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On my W123 with a similar issue I had to flush the heater core. First I replaced the monovalve, which may or may not have had a torn diaphragm. That didn't help so I bypassed it. That also didn't help, so I pulled all three hoses from the heater core, flushed and backflushed several times with a garden hose, and then hooked it back up. Has put out incredible heat since then.
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Quote:
Since 2007 it has only happens to 2 members but after the flush their heater core leaked inside of the Car. The same happens slightly more often with the Core/Freeze Plugs. With either one you could say it was eventually going to leak any way but it is a lot of work to remove the heater core.
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84 300D, 82 Volvo 244Gl Diesel |
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Quote:
My '84 300D has more heat than I want. No dialing it down apart from turning it on and off. I'm still working on it. First need to get vacuum correct.
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1986 300SDL, 362K 1984 300D, 138K |
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The 240D and 230 in the us market had manual climate control with a normal heater valve and linkages etc... .
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Oh well, it is what it is. I had plenty of oppoetunity not to buy my current Benzes and I knew about climate control but I bought them anyway. My E30s had their own headaches.
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1986 300SDL, 362K 1984 300D, 138K |
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Quote:
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1981 240D 4sp manual. Ivory White. |
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