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Old 10-11-2002, 02:30 AM
rdanz's Avatar
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Dealer Captive

HELP I have a 94 S350 thats running hot, the car is a Starmark that I bought it has 69000 miles and is flawless.
Took to dealer for running hot and upper radiator collapsing when cold dealer "supposedly pressure tested system" and said cap was bad I had checked cap before going and it tested fine. when I went to pick up car hose was collapsed with new cap they installed. Now there scratching there heads and they want to replace hose and there not sure it that either. when cap is released hose fills out. What could be wrong. they claim its not the head.
Funny the things there fixing are not covered under Starmark.

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Old 10-11-2002, 03:55 AM
Car Killer
Join Date: Jan 2002
Location: Northern VA
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Possibly a coolant leak that seals up when it cools down? Metal expands when heated and crack opens up, then contracts when cools, seals the leak, and collapses the hose under vacuum? I'd bet its running hot because the leak is venting the pressure when hot. Head cracked?
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
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Old 10-11-2002, 04:19 AM
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Weak hose

The hose could be deteriorating. It should hold its shape when cold despite the depression in the cooling system. A new hose may be all that is needed.
Cheers, Neil
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Old 10-11-2002, 06:11 AM
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The radiator cap was the most likley problem . When the cooling system is hot it will vent excess coolant through the cap into the overflow bottle and when the system cools down it draws the coolant back into the system from the overflow bottle. Its possible that there is a blockage in the hose from the expansion tank to the overflow bottle. If the system is not venting properly even a new hose will collapse.
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Old 10-11-2002, 10:23 AM
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Location: Plano, TX
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I'm thinking head gasket. I guess the question is whether the running hot is a symptom of the collapsing hose (or the other way 'round) or whether both are symptoms of some yet unfound malady. Have you ever completely overheated the engine?
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Old 10-11-2002, 10:30 AM
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Earlier this year I went through a string of bad expansion tank caps. The 4th one finally worked. Went through the same deal you did - hose kept collapsing.

Not saying this is your problem - just saying that you'd be surprised how often various parts go through production problems.
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Old 10-12-2002, 07:49 AM
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The dealer now states they contacted Mercedes Factory Rep and he said "Normal Hose collapse due to fluid contraction when cold"
"If head gasket failed the hose would expand" and that a temp of 100 celsius is normal.
My question is how does fluid "contract"
and how many of you have cars that run at a 100?
Engine is clattering and milage has been droping steady.
the say to change to Hess Fuel as that theres nothing wrong with engine.

I have this in writing from dealer.
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Old 10-12-2002, 11:22 AM
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New cap installed by dealer same problem hose collapses when car cools down
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Old 10-12-2002, 11:46 AM
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Something else to consider:

bad hose - cap still bad - bad expansion tank - t-stat issue.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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