Well Im pulling the water pump tonight. Got everything all loosened up for when my parts get here later today.

Drained the radiator and took the monovalve off. There's my no heat problem - the pick up screen was plugged with white powder. I dont think its citric acid, its something else. Sort of chalky and not dissolvable in water like the citric. Cleaned it all out and not thats back in.

So tonight out comes the water pump, new one goes in and on with my citrus flush I go....$350 later :-)

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

I feel your pain, I lost my water pump a few days after I flushed the cooling system. The citric acid must compromise the (aged) WP shaft seal. Checking the weep hole for a few days after the flush should be part of the CA flush directions.

Mine died on the highway, luckily I noticed the heat creeping up before I lost the engine... at least you didn't have to pay for a tow.

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Cheers,
Robert

water pump in and working...still minimal heat from the vents.

chalky stuff is caked everywhere. what is this stuff? I started a new thread asking that question to see if anyone knows. it cant be good.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

I know on older 123's you have to burp the radiator. Have you done that?

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Update:

Unclogged mono valve and flushed until the cows came home yesterday in the New England cold. I think I have 99% of the white chalk out.

Still no heat. Maybe I missed something?

How can I best flush the heater core or determine coolant is running through it? Is there a good way? Is there a diagram of the heater core somewhere?

wimutt - I have burped the radiator.

I need some ideas before I go back into battle tonight.

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

So what happened with this one?

What was the fix?

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

blocked/clogged heatercore?

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Find the 2 hoses for the heater core that goes thru the firewall and undo the hose clamps. Stick a garden hose in one hose, water should come out the other. If nothing comes out, stick the garden hose in the other hose and go back and forth till it flows. Also try compressed air if water pressure is not enough. To bleed the air out, if nothing else works, make a plug for the expansion tank and pull a vacuum.

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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

bing bing bing, we have a winner.

I swapped out the heater core when I pulled my dash for A/C evaporator.

The heat in the car can burn my face off now. I love it.

Beware the citrus flush!

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

Why did you do the citric acid flush? Was your car over heating?
Good you have heat again. This all started with a broken nipple on the radiator? I cracked mine 3 years ago by leaning on it. Didn't break off, just cracked and leaked. I cleaned and dried off the area and put shoe goo on it. That was 3 years ago. It still seeps a tiny tiny amount. I meant to cut the nipple off and thread a brass barb fitting in there but haven't gotten around to it. I flushed the green coolant out of mine a few weeks ago and decided not to do a citric acid flush (even though I bought some) because my 300D does not overheat on the hottest days and reading about all the horror stories related to citric acid flush. If it aint broke, don't fix it!

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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