Send oil sample to Larry, lab can pick up presence of glycol in oil.  That 
narrows it to cracked head or blown head gasket.
-- 
Max Dillon
Charleston SC
'95 E300, '87 300TD, '73 Balboa 20

Curt Raymond <curtlud...@yahoo.com> wrote:

>So how do I at home troubleshoot a blown headgasket?
>
>Driving to work yesterday my '78 240D started to heat up in heavy
>traffic, once I was moving it was okay, I cranked the heat which blew
>hot and got it to work.
>At lunch I added maybe a quart of coolant which brought it up to just
>below the neck of the radiator.
>
>On the way home the temp started to rise, again in heavy traffic, so I
>pulled over and added (fortunately I'd left the cap loose) most of a
>gallon(!) of water. I got home but the temp would tend to creep up
>(slowly) if I stood still. When I got home I got most of another
>gallon(!) of water into it...
>
>Today Angie went to take it to work and it started to heat up again
>after not much distance. In playing with it I find I can put coolant it
>but it bubbles right out of the neck of the radiator again.
>
>Playing some more I put my mity-vac on the overflow port, put my palm
>(with rubber gloves on) over the fill hole and dragged the radiator
>down to 10" of Hg which compressed the upper radiator hose good and
>didn't seem to leak out other than where it leaked around my hand and
>around the mity-vac.
>
>As another point I can't get hot air out of the heater...
>
>I have 2 current theories:
>
>#1. The headgasket is toast. Since the car is fairly rusty this means
>the car is toast, its not worth a headgasket.
>
>#2. The thermostat has stuck shut but this doesn't explain coolant
>bubbling out of the radiator neck...
>
>No rising oil level, no white plume out the back, no excessive coolant
>smell out either the back or in the oil.
>
>Angie wants to buy a diesel Jetta, I don't want that big car payment
>but I'm tired of screwing around with cars and I guess if it came down
>to a Ford Fiesta I'd prefer the Jetta although I should go drive one
>before I say that.
>
>-Curt
>
>-Curt
>
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