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Testing for pluggage in 1985 300D heater core
I've got the car in that is kicking my butt in regards to making the heater work ( A/C blows cold. Anyway, I've got a known good monovalve installed and even with the wire at the monovalve disconnected it still blows cold whether I am at idle or driving down the interstate. My next step is going to be to disconnect the hoses at the firewall and see if I can blow through the heater core. Any other things to consider while in there. tia
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Jim |
#2
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disconnect the hose to the top of the mono valve and pump back towards the fire wall.
disconnect the hose on the back of the head so that if there is anything in there it will flush out there instead of into the engine or radiator.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
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Is the heater core hard to get at on the w123? Just curious cause I know someone who has one that might be leaking.
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What Would Rudolph Do? 1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius |
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Lol, I don't even want to have to think about replacing heater core. Not necessarily as much a pia as time consuming.
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Jim |
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I have removed about 5 of these in the PNP yards, and it is a bit of work to do. The heater Core sits vertically facing the radio part of the dash panel. On the Firewall (eng side) you will see the 3 pipes the heater hoses connect to. These pipes are bolted to the Heater Core. So it isn`t something you can easily lift out. Plus you will have to discharge the AC Freon if there is any. The Heat/AC control box assy. is three pieces with side clips that hold the case together, you have the AC Evaporator, Blower Motor, Heater Core, and vac lines etc... As mentioned by Engatwork, time consuming. I wish this was as easy and the one I just replaced on my 86 Ford F-250. 2 heater hoses on the Eng. side, drop the knee panel on pass side. and there she is looking at you. Easy R&R. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
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Hmm
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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...don't know if that was also with AC - if I remember correctly it wouldn't have been too hard to do that with my Euro non AC unit. Still I'd be looking at the valves that open or close the flow first. (Again never seen an AC unit so I don't know how that works - my 300D has two little white plastic taps with cables that go into the cockpit - all very simple)
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! |
#8
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Have you checked your auxillary water pump to see if 12 volts makes it pump and its not plugged?
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#9
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Have verified that all your vacuum pods are working? I had a issue in my 126 where the cold air from deforst would blow at same time as heat .
After replacing the pods including the main flap all air comes out where it is supposed to. Just a thought. greazzer2b |
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What Would Rudolph Do? 1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius |
#11
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Here is a couple pictures of the unit. Here is the heater box out, and one the driveway. You can see the 3 aluminum pipes at the top of the picture, the core is behind the center vent opening. That center panel needs to come off as I remember, so maybe the whole box does not need to be removed from the vehicle. Remove it and the core may be able to lift out. And the heater Core. I borrowed these form a couple other threads. Also daw_two has a good set of pictures: How To Disassemble A W123 Manual Airbox Photos by daw_two | Photobucket Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works Last edited by charmalu; 01-15-2015 at 12:26 PM. |
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working to hard
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Reverse flow through the heater core, full volume with a garden hose. To clear the air vanes. Blast two full cans of scrubbing bubbles through the air ducts. Flush the duct work / heater box with massive volumes of water. YES, the floor pan will flood, be prepared. .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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Jim |
#14
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Thank goodness the heater core is fine.
I'll be dog gone. Something is going on at the other end of the engine. Upper radiator hose is hot and lower is cold so I will be getting into engine cooling system sometime today.
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Jim |
#15
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But upper hot lower cool (progressively on radiator) is normal. Laws of physics.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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