Strange cooling system problem - exhaust gas entering system??

gsxr Strange cooling system... 12-18-2001, 11:52 AM

Guest exhaust gas in radiator test 12-18-2001, 12:45 PM

michael rybikowsky The way you discribe,things... 12-18-2001, 03:21 PM

Ken300D My '87 300D holds radiator... 12-18-2001, 03:32 PM

gsxr Hi Ken, The problem is... 12-18-2001, 03:52 PM

michael rybikowsky I have had cars over the... 12-18-2001, 04:51 PM

gsxr I know, I've heard that from... 12-18-2001, 05:14 PM

Guest Head is cracked 12-19-2001, 09:10 PM

gsxr Mark, that's what I was... 12-19-2001, 09:56 PM

Ken300D I think people are confusing... 12-20-2001, 04:02 AM

engatwork On my 300D that coolant... 12-20-2001, 07:04 AM

Guest What an intresting post. Sure... 12-20-2001, 10:54 AM

gsxr Thanks, Craig. That's what I... 12-20-2001, 11:24 AM

Ken300D An additional source of air... 12-20-2001, 12:33 PM

MikeTangas Easy test. With the engine... 12-20-2001, 01:08 PM

Lance Allison I had a similar problem with... 12-20-2001, 03:23 PM

P.E.Haiges I've replaced the... 12-20-2001, 07:20 PM

engatwork wow PE - do you really leave... 12-20-2001, 07:31 PM

Ducati Crack in Head... 12-20-2001, 07:48 PM

Guest Cracked Head 12-20-2001, 08:07 PM

psfred Oil dribble into the coolant... 12-20-2001, 08:45 PM

mplafleur In a truely 'closed' system,... 12-20-2001, 10:37 PM

psfred If you have a leak at the... 12-20-2001, 11:02 PM

P.E.Haiges I found out about Evans on... 12-20-2001, 11:40 PM

P.E.Haiges A no pressure system may... 12-21-2001, 10:25 AM

Bzoo HI. Is it possible the old... 12-22-2001, 02:27 PM

Guest This thread made me curious.... 12-22-2001, 04:14 PM

msyoder Cracked Heads :( 01-03-2002, 10:46 AM

psfred Nope, a cracked head will... 01-03-2002, 09:49 PM

Ducati Evans WaterlessCooling System? 01-03-2002, 09:54 PM

msyoder Uh oh! 01-04-2002, 03:48 PM

psfred Typical problem with these... 01-04-2002, 08:33 PM

gsxr About the Evans coolant stuff... 01-04-2002, 09:36 PM

msyoder Craked Head! 01-05-2002, 11:42 PM

gsxr Hi Mike, Wow - bummer!... 01-06-2002, 01:23 PM

psfred Mike: Sadly, I suspect you... 01-06-2002, 04:31 PM

P.E.Haiges Msyoder, Does the new head... 01-06-2002, 05:04 PM

autozen GSXR The only dynamic test... 01-06-2002, 07:05 PM

gsxr PEH, Remember - this is an... 01-06-2002, 07:12 PM

msyoder Cracked Head :( 01-07-2002, 08:53 AM

engatwork Now ya'll have got me... 01-07-2002, 06:01 PM

Ken300D It's normal behavior, but I... 01-07-2002, 06:29 PM

gsxr Ah, Ken, Ken, Ken. I'm not as... 01-07-2002, 06:54 PM

psfred Jim: Sounds like your aux... 01-07-2002, 07:38 PM

gsxr Peter, So far I haven't... 01-08-2002, 01:12 AM

P.E.Haiges If your engine starts easily,... 01-08-2002, 03:02 PM

gsxr PEH, I'm not sure I... 01-08-2002, 04:06 PM

psfred Dave: The ALDA just sit on... 01-08-2002, 08:51 PM

P.E.Haiges GSXR, I'm not sure what a... 01-09-2002, 11:43 AM

gsxr PEH, Yes, the OM603.96x is... 01-09-2002, 01:29 PM

msyoder I must agree with Dave. I... 01-09-2002, 05:40 PM

engatwork I was wrong about it being... 01-13-2002, 08:10 AM

P.E.Haiges GSXR, I looked at my 603... 01-13-2002, 11:10 AM

12-18-2001, 11:52 AM

gsxr

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Strange cooling system problem - exhaust gas entering system??

Hi all,

My 1987 300D developed a strange problem suddenly. The cooling system remains under high pressure even when stone cold (left overnight). Yes, I have replaced the radiator cap. The car has never done this in the previous 4+ years I've owned it. The only way I can think of abnormal pressure in the cooling system would be from exhaust gas entering. How do I test if this is happening? The coolant looks clean and smells fine (to me.) There is no oil in the coolant or vice-versa. I suspect either the head gasket or a crack in the head (shudder.) I'm at a loss here... Help!

Dave M.
Sacramento, CA
1987 300D - 228kmi (weird cooling system problem)
1987 300D - 234kmi
1984 300D - 205kmi

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