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Crushed top radiator hose when cold, 1987
Hi,
On my '87 300D, I notice the top radiator hose is "crushed" when the motor is cold. When I release the coolant cap, the hose goes back to normal. I have had other cars which had a steel coil inside the hose--which I assume has something to do with preventing this. This hose has no such coil. Anyway, does someone know what is up? Thanks, Roy |
That happens when a liquid (or air) in a sealed container drop in temperature....it causes contraction. Are you sure there is a 50/50 mix of MB coolant and distilled water in the system? I don't think it should do that normally....none of ours do.....
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Bad radiator cap.
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PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Expansion Tank Cap Note: 1.4 Bar G1040-30351 Expansion Tank Cap Germany IN STOCK $7.51 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1YE1FF2PQ1YN0R2ATD&year=1987&make=MB&model=300-DT-002&category=G&part=Expansion+Tank+Cap Replace it, and all will be well. :) Merry Christmas.:) |
Roy,
Actually, on older cars, the metal spring was in the lower radiator hose to keep the hose from collapsing while the engine was running. With the upper hose collapsing when cold is a demonstration of thermo dynamics and the pressure inside the cooling system being less than atmospheric pressure. This can happen if coolant level is low, as air is now in the system. Cold air contracts, warm air expands. Opening the coolant fill cap will draw in air and equalize the pressure. It also means that your system is not venting properly, or you are low on coolant. |
Yes
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A cap is cheap, mine is replaced every year. Your other points are also accurate. :) |
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Most systems have an absolute pressure below atmospheric when cold.......after running.......as evidenced by the inrush of air when opened. All of these caps cannot be NG.........??? |
Correct:
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This is another reason why I replace the cap on my car every year, it gives me a known good cap for diagnosis. This year the average for MB I worked on has been seven out of ten caps where bad. I would rather replace three good caps, than miss one bad cap. The cap, thermostat, belt and hoses are the cheapest units on your car, that can potentially wreck the engine. What is your engine worth to you? Would you knowingly choose to ignore/refuse service on these critical items? My sincere hope is that no forum member would risk their engine over these cheap items. The sad fact is that I see many MB that need all of these items at once, due to the previous owners LACK of maintenance.:( PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Thermostat Kit Note: 80 degree G4001-49781 Thermostat Kit Wahler IN STOCK $24.50 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1YE1FF2PQ1YN0TDGMP&year=1987&make=MB&model=300-DT-002&category=All&part=Thermostat+Kit PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Radiator Hose Note: Lower G2000-16382 Radiator Hose Germany IN STOCK $72.16 http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1YE1FF2PQ1YN0TDGMP&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1987&product=G2000-16382&application=000017660 PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Radiator Hose Note: Upper to thermostat G2000-16376 Radiator Hose APA IN STOCK $11.81 http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1YE1FF2PQ1YN0TDGMP&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1987&product=G2000-16376&application=000040490 PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Radiator Hose Note: Lower G2000-16380 Radiator Hose Lemforder IN STOCK $6.08 http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1YE1FF2PQ1YN0TDGMP&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1987&product=G2000-16380&application=000040496 Vehicle: 1987 Mercedes Benz 300D Turbo Part: Heater Hose Select one of the products from below ----------------------------------------- Heater Hose 12 X 19 mm : 1 meter ----------------------------------------- Heater Hose 15 X 22 mm: 1 meter ----------------------------------------- Heater Hose 18 X 25 mm : 1 meter ----------------------------------------- Heater Hose Valve to Auxiliary Pump Chassis: -A 289309 ------------------------------------------ Heater Hose Engine to heat exchanger Chassis: -A 289309 ------------------------------------------------ Heater Hose Recirculating pump to return line Chassis: -A 289309 ---------------------------------------------------- Heater Hose Return line to engine Chassis: -A 289309 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1YE1FF2PQ1YN0TDGMP&year=1987&make=MB&model=300-DT-002&category=All&part=Heater+Hose PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1987 Mercedes Benz 300D Turbo Part: Multi Rib Belt Note: 21.36 X 2145 W1000-21016 Multi Rib Belt Conti IN STOCK $27.03 W1000-21016 Multi Rib Belt Bando IN STOCK $20.92 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1YE1FF2PQ1YN0TDGMP&year=1987&make=MB&model=300-DT-002&category=All&part=Multi+Rib+Belt Acc. Belt Idler Pulley Acc. Belt Tension Adjuster Acc. Belt Tension Damper Acc. Belt Tension Spring |
Thanks, I'll get a new cap today
I was hoping no one would say I had head problems.
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About a month ago, test drove an '87 at a dealer, checking it out for a friend in another state. Still had the factory cap on the expansion tank, after 20 years and 136K miles.
Doing the check for oil in the cooling system (for a cracked head), I removed the radiator cap...... Then I removed the spring, and then the rubber diaphragm!:eek: It was so old it had literally fallen to pieces, the cap holding everything in place once screwed on. That, the red mung growing in the expansion tank, and a few other items that screamed "no maintenance", lead me to tell my friend to avoid that beast. I did do the dealer, and any unknowing buyer, a small favor. I told him what I'd found, and that if he wanted to have a prayer of ever selling that car he'd best flush the cooling system and install a new cap. |
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