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#1
09-16-2010, 08:17 PM
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SD Cooling Weirdness
So I drove my SD today to school, drive perfect, nice smooth idle, good power etc.
I get home, and theres some smoke coming from under the hood. I figured it was the air can drain tube, sometimes it comes off. So I look, nothing apparently wrong however, I squeezed the upper rad hose and there was no pressure in it. I removed the exp tank cap, nothing hissed or did anything. There was coolant in there, it was low though. The gauge had been reading 78-79C all day. So I thought all was good. I have heat in the cabin.. I refilled the tank, and drove around my test track area...no change. still no pressure in the upper hose, reservoir is full. Gauge still says 78-79C I AM CONFUSED. 
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#2
09-16-2010, 08:45 PM
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That smoke... was it smoke or steam? And where is it coming from?
What amount of pressure are you expecting from the upper hose? I usually don't feel any particular pressure when I squeeze it; Sure, I can feel it has coolant inside, but not really high pressure... I'm not sure you have a problem there except for the smoke / steam...
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[/SIGPIC]~cirrusman 1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang" [SIGPIC] 1983 Toyota Tercel (Tommy, The little Toyota that could) 1965 Ford F100 (Grandma Ford) 2005 Toyota Sienna (Elsa, Wife's ride) Gone: 1988 Toyota Pickup 2004 Subaru Outback 1987 Cadillac Fleetwood Brougham 1986 Volvo 740 GL Station Wagon - Piece of junk. 1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.  1987 Pontiac Fiero GT
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#3
09-16-2010, 09:04 PM
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Well I think it was steam... I saw some coolant coming out of the t-stat housing/upper hose interface (I tightened it down) It looks like it was dribbling down the housing and rolling towards the exhaust.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#4
09-17-2010, 01:40 AM
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I still dont understand why the coolant temp never gets up past 79.
I'd expect to feel some pressure in the upper hose, on the 201 the upper hose gets hard once the t-stat pops..indicating water flow. But the SD's I could easily pinch shut... This seems to point to a bad thermostat. However, with a bad thermostat the water would just circulate in the block, and the temp gauge would definitely rise above 79....
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k Last edited by JamesDean; 09-17-2010 at 01:54 AM.
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#5
09-18-2010, 11:07 AM
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IR Thermometer says around 177F at the tstat housing, but no pressure in the upper hose...
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#6
09-18-2010, 11:28 AM
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not exceeding 79C could just mean your radiator is working well.
the lack of pressure is because of a leak in your cooling system. either a bad cap, a leaking hose, or something broken. you will need a pressure tester to pump up your cooling system. find where water escapes and fix it. if the cooling system holds pressure fine, no leaks at all, then you have a bad cap. change it.
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#7
09-18-2010, 11:45 AM
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Hm I dont think its the cap, I traded caps with my other SD and nothing happened.
I'll have to get a pressure tester...can i rent one from the local auto parts store that'll work? If I'm not mistaken, these t-stats start opening at a certain temperature..and then fully open at a later temperature.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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