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#1
10-24-2010, 12:05 AM
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93 mercedes 300se question
hi.. i have a problem with my 1993 mercedes 300se interior heat no putting out. the blower motor works fine but i notice the big hose entering the firewall right there by the oil filter is hot. also i notice there is two small hoses going to the monovalve the one at the bottom is cold the one at top is hot. what does that mean any ideals thanks for your time and help.
Last edited by Sylvester; 10-24-2010 at 07:38 AM. Reason: no repley 
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#2
10-24-2010, 03:29 PM
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My 85 300D did that
So I parted it out. Well, I did, but not for that. Anyway, about the same system with that monovalve and when mine did stop, I made sure the vacuum and electrical connections were good (and clean) and it solved the problem. There is a low cost rebuild kit for the monovalve also. But make sure you are getting electrical power to the thing.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it!
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#3
10-24-2010, 06:59 PM
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A 93 is a 140 which should have a duovalve not a monovalve, which normally you'd think "what's the difference" but the duovalves are a different design and usually are very dependable, no diaphragm to rip.
The 2 small hoses you mention, see if it looks like it leads to the base of the windshield, has a heated bladder at the base which is also heated by the coolant. It keeps the area where the wipers rest on the windshield warm in the winter so the wiper blades don't freeze to the glass. Gilly
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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#4
10-24-2010, 07:02 PM
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Quote:
The thought about the electrical connections and making sure it has power going to it would be not the right thinking. If the monovalve (or duovalve) LOSES power or has a bad connection, the "default" for the valve without power is full heat (it's a safety thing). As a matter of fact one test you COULD do is to disconnect the electrical connector to the duovalve and see if you then have heat. Does the engine temp gauge go up to about 1/2 way? Possibly the engine is just not warming up. Gilly
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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#5
10-24-2010, 08:42 PM
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mercedes benz question
ok..i disconnect the wire to the valve and its getting power no change im getting just a little heat also the big hose going to the heater coil, up there by the wiper is very hot. and one of the small hoses going to the valve is cold the other is hot. i been dealing with this a long time im ready to fix this bad boy what should i do next i really appreciate your help.
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#6
10-24-2010, 09:30 PM
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What happens if you run it in defrost mode?
WHAT is the engine temp indicating?
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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#8
10-25-2010, 05:18 PM
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OK, just make sure the coolant level isn't low.
Gilly
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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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