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  #1  
Old 06-06-2019, 11:55 AM
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Question Collapsed upper radiator hose for '95 e300

After a long drive back from Chicago to Cleveland, I noticed the next day that my upper radiator hose was collapsed on my '95 e300. It stayed collapsed even after I loosened the radiator cap and drove it a short 2 mile local trip.

Temp on both trips came up to just over 80c on gauge and was steady.

I've changed the radiator cap in last six years since I've owned the vehicle with OEM cap.

Time to change the radiator hose? Thermostat issue?
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Old 06-06-2019, 12:59 PM
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It's either the cap or the overflow return line is clogged.
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  #3  
Old 06-06-2019, 01:01 PM
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Should this upper radiator hose have a wire spring inside to prevent the hose from collapsing?
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  #4  
Old 06-06-2019, 01:03 PM
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I had a bad cap when this happened to me!
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Old 06-06-2019, 01:21 PM
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Quote:
Originally Posted by Father Of Giants View Post
It's either the cap or the overflow return line is clogged.
^ This.

When the cooling system returns to ambient temperature, there needs to be a way for expelled coolant (which expanded when it heated up during operation) to flow back into the system, otherwise a vacuum will be created. A properly-functioning cap and free-flowing return line prevents vacuum from occurring. The collapsed hose isn't the problem, it's just a symptom.
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  #6  
Old 06-06-2019, 01:31 PM
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Since the hose stays collapsed with the cap loosened (relieving vacuum on the system), the hose is softened to the point it's time for replacement, or there's a clog somewhere in the system that's preventing the vacuum from breaking in the main coolant circuit when you open the cap. Radiator hoses are cheap compared to the cost of engine R&R...
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Old 06-06-2019, 01:56 PM
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True, might as well replace the hose for good measure and cheap insurance.
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1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.
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  #8  
Old 06-06-2019, 02:18 PM
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I had that on my old E300 forever, but the vacuum broke immediately when I loosened the cap on the tank.

I later on put a metal coil in both upper and lower hoses - the same type you see in older american vehicles.
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