Search messages and discussions

Search preserved mailing-list messages and current email and website contributions. Current posts are searchable before weekly archival. Recovery gaps remain possible. Words are matched together; try fewer terms if needed.

Page 1+: 60 results shown for Coolant pressure cap.

Source-balanced relevance: matches from both collections are interleaved, with source dates breaking ties. Restoration time is not the original posting date.

• DIY / Homemade coolant system pressure testing
  Historical mailing list - TinkerMan
  Thu, 15 Aug 2002 21:51:50 -0700
  ...AFAIK, that pressure release cap has a 15psi threshold that releases extra pressure into the coolant reserve tank and sucks coolant back when vacuum...
• pressure coolant cap thing-y
  Historical mailing list - Dan Houg
  Mon, 23 Jan 1995 13:12:48 CST6CDT
  ...Actually, the valve is 2-way because if the coolant system pressure reaches the cap pressure rating, it will purge coolant (there-by relieving...
• Re: Coolant Rising Mystery
  Historical mailing list - John Rodgers
  Sun, 24 Mar 2002 13:29:39 -0600
  ...As the coolant heats it expands, building pressure, at the preset pressure in the overflow cap, the little valve in it opens and allows...
• Re: 86 Coolant Pressure Leak/Problem.
  Historical mailing list - Michael A. Radtke
  Wed, 25 Aug 1999 07:57:11 -0700
  ...It's cap is a simple screw on type. The expansion tank cap has two valves. One valve releases pressure (and coolant) into the...
• Coolant with Zero Pressure
  Historical mailing list - Lawrence Johnson
  Sun, 14 Oct 2001 22:00:13 -0400
  ...pressure cap but I'm not sure if it will hold with the real pressure cap. What is the harm of running the coolant...
• Re: Filling the coolant reservoir...
  Historical mailing list - Scott
  Tue, 10 May 2016 13:37:45 -1000
  ...the guy google 'coolant recovery pressure cap for > automotive cooling systems, > > then maybe he'll believe coolant expands, such a cap accomodates > expansion by...
• Re: head gasket problem ?
  Historical mailing list - Michael A. Radtke
  Fri, 21 Sep 2001 11:27:18 -0700
  ...The resulting foam carries coolant out the pressure cap just like a bad head gasket leak. So, I'd try the inexpensive pressure cap...
• Re: Filling the coolant reservoir...
  Historical mailing list - Scott
  Tue, 10 May 2016 12:29:41 -1000
  perhaps have the guy google 'coolant recovery pressure cap for automotive cooling systems, then maybe he'll believe coolant expands, such a cap accomodates...
• Re: Coolant leak, expansion tank pressure cap
  Historical mailing list - Rick Cooper
  Thu, 1 May 2025 07:35:26 -0700
  ...Should be: "At the same time, I don't think my pressure cap is properly releasing coolant to the overflow tank as the engine...
• Re: Filling the coolant reservoir...
  Historical mailing list - John Rodgers
  Tue, 10 May 2016 17:56:53 -0500
  ...perhaps have the guy google 'coolant recovery pressure cap for automotive cooling systems, then maybe he'll believe coolant expands, such a cap accomodates...
• Re: coolant overflow tank
  Historical mailing list - Dennis Haynes
  Tue, 26 Feb 2013 00:38:56 -0500
  ...Should the coolant overflow tank drain freely through the tube that connects to the pressure cap? I disconnected the connecting tube at the pressure...
• Re: Filling the coolant reservoir...
  Historical mailing list - Dennis Haynes
  Tue, 10 May 2016 20:15:25 -0400
  ...Thus not only does the pressure cap deal with the vapor pressure but the expansion of the coolant medium itself. So here the cap...
• Coolant leak, expansion tank pressure cap
  Historical mailing list - Rick Cooper
  Thu, 1 May 2025 07:31:15 -0700
  ...At the same time, I don't think my pressure cap is properly releasing coolant to the overflow tank as the engiine as it...
• Re: Lost coolant cap?
  Historical mailing list - Dan N
  Tue, 9 Jan 2018 18:39:45 -0800
  ...The 2-way blue cap dumps some coolant in it when the pressure exceeds the limit and it sucks the coolant back in when...
• Re: coolant resevoir cap
  Historical mailing list - Gerald Masar
  Fri, 2 Feb 2001 23:48:36 -0700
  Chris, Yes, it functions the same as a radiator cap, and is under pressure. It opens when hot to let excess coolant into the...
• coolant overflow tank
  Historical mailing list - Bill MacLachlan
  Mon, 25 Feb 2013 21:26:36 -0800
  ...Should the coolant overflow tank drain freely through the tube that connects to the pressure cap? I disconnected the connecting tube at the pressure...
• Re: A Different Coolant Problem
  Historical mailing list - mark drillock
  Mon, 9 Sep 2013 12:52:49 -0700
  ...The normal leaking mode is that the pressure regulation system of the cap fails and then coolant is easily pushed into the overflow through...
• Where to get coolant system Pressure Checker?
  Historical mailing list - Mike Braden
  Sat, 22 May 2004 18:16:34 -0500
  Does anyone know where to get the coolant system pressure checker (attaches either to the pressure cap or the coolant tank) for an 1983...
• Re: Coolant System Pressurization Woes
  Historical mailing list - Rico Sapolich
  Sat, 31 Mar 2001 20:21:55 EST
  ...If a foreign particle becomes lodged in the pressure or vacuum valve inside the pressure cap, the coolant system will not under normal operating...
• Re: Blowing coolant hoses.
  Historical mailing list - Dan Houg
  Wed, 28 Jun 1995 14:49:18 CST6CDT
  ...too, pressure cap should blow off pressure at 15psi or > so, anyone verified a pressure cap malfunction. You should blow your coolant > into the...
• Re: Overflow coolant Tank
  Historical mailing list - John Rodgers
  Sun, 26 Feb 2006 09:16:20 -0600
  ...coolant tank cap. They only cost about $10.00 and over time the valve inside ages and does not let excess coolant and pressure...
• Re: 84 coolant light.
  Historical mailing list - Scott Daniel - Turbovans
  Wed, 2 Sep 2009 13:09:40 -0700
  ...there's a little valve in the pressure cap just for this. When things cool down, and the coolant contracts ......it sucks some back...
• Re: '86 Westy coolant questions
  Historical mailing list - Hector Zapata
  Sat, 7 Apr 2012 18:32:47 -0400
  ...Replaced the cap with the old one, installed a new coolant sensor, and apparently that fixed my coolant leaking/bubbling problem. Tomorrow, to check...
• Re: Bleeding coolant
  Historical mailing list - Dennis Haynes
  Fri, 23 Feb 2007 15:44:42 +0000
  Are you checking the coolant level in the overflow tank, (behind the license plate), or the important tank, the pressure tank which is the...
• Re: head gasket problem ?
  Historical mailing list - Larry Alofs
  Sat, 22 Sep 2001 08:15:46 -0500
  ...The resulting foam carries coolant out the > pressure cap just like a bad head gasket leak. > > So, I'd try the inexpensive pressure cap...
• Re: Flashing coolant light?
  Historical mailing list - Larry Alofs
  Tue, 28 Aug 2001 11:34:35 -0500
  ...If the flashing is truly caused by low coolant in the pressure tank and you have a good pressure cap, "air" may be getting...
• Re: Blowing coolant hoses.
  Historical mailing list
  Wed, 28 Jun 1995 16:17:25 -0300
  ...too, pressure cap should blow off pressure at 15psi or so, anyone verified a pressure cap malfunction. You should blow your coolant into the...
• Re: Help! Problems on the road! Smoke! or something that smells like it, anyhow...
  Historical mailing list - Ben huot
  Tue, 23 Mar 2004 13:11:18 -0500
  ...com/pressure_test.htm Leak / loss of pressure can be internal or external. Most common external coolant lost in order: -Expansion tank cap -Expansion...
• Re: A Different Coolant Problem
  Historical mailing list - Tom Carchrae
  Mon, 9 Sep 2013 13:19:21 -0700
  ...The normal leaking mode is that the pressure regulation > system of the cap fails and then coolant is easily pushed into the > overflow through...
• Re: A Different Coolant Problem
  Historical mailing list - mark drillock
  Mon, 9 Sep 2013 13:59:33 -0700
  ...cap, where > does the air/gas come from the displaces the coolant - and why does it not > pull the coolant back into the pressure...
• Re: Coolant with Zero Pressure
  Historical mailing list - Peter Krogh
  Mon, 15 Oct 2001 12:47:26 EDT
  ...pressure cap but I'm not sure if it will hold with the real pressure cap. What is the harm of running the coolant...
• Re: Lost coolant cap?
  Historical mailing list - Jennifer Rabbitt
  Wed, 10 Jan 2018 00:59:53 -0800
  ...The 2-way blue cap > dumps some coolant in it when the pressure exceeds the limit and it sucks > the coolant back in when...
• Re: coolant overflow tank-OOPS!
  Historical mailing list - Dennis Haynes
  Tue, 26 Feb 2013 01:18:16 -0500
  ...coolant overflow tank The cap has two valves in it. There is the pressure relief that opens when the pressure in the cooling system...
• Blue coolant cap
  Historical mailing list - C Snyder
  Sun, 6 Jan 2019 21:20:29 +0000
  I bought a blue coolant cap  that is an off brand one for my 1987 Vanagon as the on on the van is leaking...
• Re: Overflow puking water
  Historical mailing list - George Goff
  Tue, 18 Nov 2003 07:58:39 EST
  ...rad cap, found that it wasn't holding any pressure. >> Bomb, my man, in my experience, the most obvious cause of the coolant overflow...
• Re: '86 Westy coolant questions
  Historical mailing list - Dennis Haynes
  Sun, 8 Apr 2012 01:04:02 -0400
  Both style caps should work. So should the black or blue ones. It is possible you got a bad one. Once the coolant level...
• coolant resevoir cap
  Historical mailing list - Chris D'Amico
  Fri, 2 Feb 2001 17:49:53 -0800
  dear list, is the main coolant resevoir cap (not the overflow res.) supposed to be a pressure sensitive type? i thought its main job...
• Re: My Coolant Runneth Over
  Historical mailing list - Michael A. Radtke
  Wed, 26 Jan 2000 08:25:51 -0700
  ...The pressure cap is the cap on the expansion tank, not the coolant overflow tank. It is on the left rear side of the...
• Re: Coolant with Zero Pressure
  Historical mailing list - Dennis Haynes
  Sun, 14 Oct 2001 23:14:23 -0400
  ...Coolant with Zero Pressure The rad sprang a leak and to limp home I used a zero pressure cap on the 'pressure' tank. I...
• Re: Lowering Coolant Pressure for Headgaskets
  Historical mailing list - Austin
  Tue, 19 May 1998 20:52:39 -0700
  ...Magee I believe the pressure level from the coolant side is obtained from the 'radiator' cap (on the expansion tank on the v'gons...
• Cooling System Results - Interpretations anyone?
  Historical mailing list - Richard Golen
  Mon, 7 Jan 2008 13:20:44 -0500
  ...pressure? If the cap is bad, then would this be the reason why the overflow tank was puking out coolant and spraying coolant? 2...
• Re: Checking pressure cap function???
  Historical mailing list - JRodgers
  Mon, 29 Jul 2013 09:02:51 -0500
  ...So I'm thinking the coolant > system is creating too much pressure. Hence my request for a way to check > if the cap is...
• Re: '86 Westy coolant questions
  Historical mailing list - Hector Zapata
  Sun, 8 Apr 2012 08:51:00 -0400
  ...Replaced the cap with the old one, installed a > new > coolant sensor, and apparently that fixed my coolant leaking/bubbling > problem. Tomorrow, to check...
• Re: Coolant Strangeness
  Historical mailing list - Scott Daniel - Turbovans
  Mon, 22 Aug 2011 18:48:59 -0700
  I suppose one could plug the overflow hose nipple on the blue coolant cap .. but that's not right of course. On in an...
• Coolant leaking
  Historical mailing list - jeff emrick
  Fri, 24 Aug 2001 17:55:51 -0400
  ...and caps, new thermostat, coolant, and bleed the whole system. Is the cap supposed to open and close to allow for a pressure release...
• Re(2): Nervous about heads
  Historical mailing list
  Wed, 8 Jan 1997 18:19:32 -0500
  ...cap on my main coolant tank is working properly. I understand it is supposed to release coolant into the recovery tank when pressure exceeds...
• Re: A Different Coolant Problem
  Historical mailing list - Tom Carchrae
  Mon, 9 Sep 2013 14:18:13 -0700
  ...cap, where >> does the air/gas come from the displaces the coolant - and why does it not >> pull the coolant back into the pressure...
• Re: Coolant flow/air bleeding
  Historical mailing list - Ken Lewis
  Sun, 13 Jan 2008 17:12:29 -0500
  ...The pressure cap on the Vanagon is different than those in cars from the 60s. The Vanagon's cap allows coolant to be drawn...
• Re: coolant tank cap
  Historical mailing list - John Rodgers
  Sun, 20 Sep 2015 10:38:40 -0500
  ...remove the blue, dome shaped cap from the coolant pressure tank? > Does it twist off like a bottle cap,or does it pop off...
• Re: Gaskelet leak and overheating
  Historical mailing list - Richard Koerner
  Sun, 7 Jul 2024 21:06:40 +0000
  ...When the pressure cap blows off the coolant tank and coolant is lost, sure sign of blown gasket, Right? 2.1 L
• Re: San Diego area: pressure tank or cap test adapters?
  Historical mailing list - Larry Alofs
  Sat, 8 Sep 2012 20:00:05 -0400
  You should always save those old coolant pressure caps. An old cap which lets air go thru the nipple both ways easily is the...
• Re: head gasket problem ?
  Historical mailing list - Malcolm Stebbins
  Sun, 23 Sep 2001 14:24:20 -0300
  ...What I meant to say was that AFAIK, the Coolant Reservoir cap pressure relief valve is set higher! than the "normal" operating temp of...
• Re: Cooling system woes
  Historical mailing list - Kenneth D Lewis
  Sat, 15 Dec 2001 08:43:26 -0500
  ...the coolant is > not boiling, but at a traffic light the coolant heats up and, > with no pressure on the cap, the coolant expands...
• Re: San Diego area: pressure tank or cap test adapters?
  Historical mailing list - kenneth wilford (Van-Again)
  Sat, 8 Sep 2012 06:36:45 -0400
  ...Does anyone in the San Diego area have a coolant pressure tank or > pressure cap adapters to use with a pressure tester? I'd...
• Coolant bottle harbinger - opinions?
  Historical mailing list - Peter DiFalco
  Sat, 26 Jun 2010 08:20:42 -0700
  ...a) gunk in the cap http://www.flickr.com/photos/el_pedro/4735834940/ b) pressure bottle down to half capacity c) coolant in the...
• Re: Overflow coolant Tank
  Historical mailing list - George Thorburn
  Sun, 26 Feb 2006 08:33:21 -0600
  ...coolant tank cap. They only cost about $10.00 and over time the valve inside ages and does not let excess coolant and pressure...
• Re: A Different Coolant Problem
  Historical mailing list - Jim Felder
  Mon, 9 Sep 2013 16:42:12 -0500
  ...cap, where > >> does the air/gas come from the displaces the coolant - and why does it > not > >> pull the coolant back into the pressure...
• coolant tank cap
  Historical mailing list - Stan Shapiro
  Sun, 20 Sep 2015 08:25:08 -0700
  90 Westy, 2.2 WBX How do you remove the blue, dome shaped cap from the coolant pressure tank? Does it twist off like...
• Re: coolant fairies...(long)
  Historical mailing list - Robert Keezer
  Fri, 13 Jul 2001 12:38:47 EDT
  ...The cap regulates the flow-when a certain pressure is reached, the cap valve open, releasing pressure and coolant. Pressurized systems do this to...
• Re: Blam! Bleeder valve destruction and some other thoughts!
  Historical mailing list - Mark McCulley
  Tue, 28 Mar 2023 08:29:28 -0700
  ...pressure caps be tested whenever they are replaced and when there are issues around coolant leaks. Some parts stores like Autozone loan out pressure...