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#1
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W210 owners: Do you have residual pressure in the cooling system?
I've had this symptom lately and I'm baffled. If interested see my previous thread about this for a more extensive discussion:
http://www.peachparts.com/shopforum/showthread.php?t=134756 I don't have any fluid mixing, virtually no coolant loss, and both I and a local shop tested the cooling system with a pressure tester and it held pressure perfectly and with no pressure fluctuation with the engine running. I still suspect a tiny head gasket leak, but with no solid evidence I'm not about to tear the engine apart. I'm wondering if these engines do in fact intentionally accumulate some pressure for cooling purposes or if it's just the nature of the beast. So I'd like some volunteers to check their cars after they completely cool down and feel the upper radiator hose and then listen for pressure release while loosening the cap and post your results here.
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2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL |
#2
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Come on guys, I know I'm not the only one here with a W210 diesel.
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2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL |
#3
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I believe you should have some pressure. Not rock hard radiator hose presssure, but slight whistle when cap removed pressure.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section |
#4
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My wife is out of town with our E300 but she will be return tonight - I'll check for residual pressure tomorrow morning and give you a report.
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#5
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'96 OM606 18xxxx miles
No pressure present after cool-off. No release from system when cap is loosened. |
#6
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Hose is soft and no pressure in the tank. This is a 99 E300 so I am not totally sure it is relavent. It is however a 210
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow |
#7
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Thanks for the responses so far. Tim, how was your pressure? So it appears I'm not supposed to have any pressure, that's what I thought. I wonder if this could have something to do with my pressure cap. Could it be that it's sucking in air when the cold coolant starts to circulate as the car is getting warmed up? I don't have a lot of residual pressure in the system, but enough to feel the difference in the hose and definitely enough to hear the pressure releasing while loosening the cap.
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2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL |
#8
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I checked this morn - nope
Just did a coolant change (and used prestone, so there!) so have been keeping a keen eye. 67k miles. let it fully cool overninght in unheated garage, no pressure. Hope you can figure things out. Regards,
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BobT 2004.5 Dodge Ram 3500 CTD QC SB 4x4 1999 E300D Deere 770 w/FEL |
#9
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Quote:
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Keep everything as simple as possible-but no simpler--Albert Einstein |
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