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kjono09 Samba Member
Joined: April 03, 2014 Posts: 191 Location: Seattle, WA
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Posted: Thu Jun 04, 2015 12:01 pm Post subject: Consolidated: Vanagon Coolant Lessons Learned |
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Thought it would be nice to have a "Consolidated: Vanagon Coolant Lessons Learned" thread for quick trouble shooting of coolant issues. This will payback to the community and ease future headache on this issue.
Please briefly add to this thread your experience, i.e.
CAUSE:
SYMPTOM(S):
SOLUTION: _________________ 84 Retro-Westy GW 2.2L (Vincent)
67 Bug 2007cc (WBX in progress) (Davey)
Submariner |
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dobryan Samba Member

Joined: March 24, 2006 Posts: 12660 Location: Brookeville, MD
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kjono09 Samba Member
Joined: April 03, 2014 Posts: 191 Location: Seattle, WA
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Posted: Thu Jun 04, 2015 12:05 pm Post subject: |
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CAUSE: Air Trapped in Radiator, not front heater core.
SYMPTOM(S):
1.) When at highway speeds, high RPMs, or when thermostat was open and using radiator heavily can started to very, very quickly overheat.
2.) Turning of engine or lowering rpm/load dropped heat quickly.
3.) Engine never overheated during around town driving in Monterrey, where it is pretty flat and cool.
SOLUTION:
1.) Through various PITA methods bleed the system.
A.) I filled system with nose of van up hill and radiator bleeder open. I ran the van on high RPM to drop level in fill tank inorder to add more coolant.
B.) I drove down hill with radiator bleeder valve slightly cracked and rear engine bleeder open.
c.) repeat, till air out of system, have all heater on full blast. _________________ 84 Retro-Westy GW 2.2L (Vincent)
67 Bug 2007cc (WBX in progress) (Davey)
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kamzcab86 Samba Moderator

Joined: July 26, 2008 Posts: 6962 Location: Arizona
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Posted: Thu Jun 04, 2015 1:13 pm Post subject: |
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SYMPTOM(S): Fan turned on high while freeway driving (2 miles from home so no overheat or flashing light). Parked in street while unloading... lake's worth of coolant drained onto pavement.
CAUSE: Dead water pump.
SOLUTION: Replaced water pump (along with a slew of hoses while the system was drained)... good for a few new curse words.
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SYMPTOM(S): Constantly topping off coolant. Finally saw a small wet spot under the left side of the van.
CAUSE: Leaky rear heater.
SOLUTION: Ripped the rear heater out and replaced the T-fittings with straight fittings. (Desert dweller who doesn't generally camp/travel in frigid conditions and never used the rear heater; prefer having the storage space... rear heater removal is not for everyone.)
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SYMPTOM(S): Pulled into a parking lot, got out and saw coolant pouring onto the pavement. Pulled the lid to find...
CAUSE: Cracked coolant tank (relatively new one at that).
SOLUTION: Replaced coolant tank (for the second time).
It doesn't have a whole slew of problems listed, however. Will add this topic into that section.  _________________ ~Kamz
1986 Cabriolet: www.Cabby-Info.com
1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"I fear the day that technology will surpass our human interaction; the world will have a generation of idiots." ~Albert Einstein |
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t3 kopf Samba Member

Joined: October 22, 2012 Posts: 994 Location: over by 'der
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Posted: Thu Jun 04, 2015 6:19 pm Post subject: |
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Symptom: After replacing all heater hoses from engine to front, and relocating the (new) meyle front heater valve to the cab directly under the heater core, found coolant dripping in the driveway from the passenger side door step area an hour after the first drive around town. Further investigation revealed the passenger side floor mat was saturated with coolant.
Cause: Brand new meyle heater valve leaking already.
Solution: Replaced with a 15 dollar ford heater valve in the same place. Dry as a bone still months later.  _________________ '90 Carat w/ '95 phase 1 EJ22 OBD2 conversion |
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volkswagenguru Samba Member
Joined: June 07, 2007 Posts: 150 Location: St.Catharines, On Canada
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Posted: Thu Jun 04, 2015 9:40 pm Post subject: |
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Symtom: Pull into doctors office to see all coolant leaking out.
Cause: blown coolant hose from thermostat to distribution tower
Solution: replaced hose.
Symtom: driving down the highway start to see small puffs of smoke next thing you know a smoke screen James Bond would be proud of.
Cause: Blown waterpump
Solution: new waterpump
Symtom: coolant overflow out of the overflow bottle only after driving in on the highway.
Causes: Bad pressure cap and blown headgasket.
Solution: replaced headgaskets on both heads new pressure cap thermostat. |
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vegpedlr Samba Member
Joined: June 07, 2014 Posts: 665 Location: TBD
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Posted: Thu Jun 04, 2015 9:52 pm Post subject: |
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Symptom(s):
Playing whack-a-mole with leaks: radiator hose clamp X2, fan switch, bleeder valve plug X2
Cause: Leaky head gasket allowed combustion gases into cooling system, over pressurizing the cooling system just looking for a weak spot...
Solution:
Head gaskets replaced and resealed |
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Vanagon Nut Samba Member

Joined: February 08, 2008 Posts: 9381 Location: Sunshine Coast B.C.
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Posted: Thu Jun 04, 2015 10:41 pm Post subject: |
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replaced ~ 90% of cooling system on an '88 WBX.
symptom: coolant loss but mostly at sustained highway speeds.
two causes:
failing O ring at coolant level sensor
failing O ring at rear heater valve.
Cause to former: aside from time, unknown.
cause to latter: during new heater hose install, wrestled hose onto upper nipple at heater. This may have hastened failure of O ring at valve. Fasteners at valve to core were not tight.
Of note, coolant loss at expansion bottle (level sensor O ring) was somewhat insidious. At times, coolant evaporated at bottle recess area before it would drip down. _________________ 1981 Westy air cooled to 15º ABA swap: http://tinyurl.com/y9n4xob8
50º ABA Swap in to '88 Westy: http://tinyurl.com/yap5hpwt
Vanagon VAG GAS engine swap Google Group:
https://tinyurl.com/2f24rmh
VE7TBN |
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avernon82 Samba Member

Joined: July 07, 2015 Posts: 291 Location: Richmond,CA
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Posted: Thu Jan 14, 2016 4:38 pm Post subject: Re: Consolidated: Vanagon Coolant Lessons Learned |
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Question:
SYMPTOM: Coolant level in pressure bottle is very high after driving
CAUSE: bad cap?
SOLUTION: replace cap? |
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Terry Kay Banned

Joined: June 22, 2003 Posts: 13331
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Posted: Thu Jan 14, 2016 5:41 pm Post subject: Re: Consolidated: Vanagon Coolant Lessons Learned |
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Symptom ;
Can't identify anything behind the van while driving on expressway at 70 mph, large cloud of white steam permeating from rear of van.
Cause;
Obvious leak /hole on outside coolant pipe behind R/H rear wheel.
Cure;
Stop on shoulder, loosen expansion tank cap, get the van to friends house, replace lost coolant with water, drive back to work, manufacture stainless coolant pipes out of 1.25" Caterpillar D-8 hydraulic tubing, drive back home with a tight system.
( Note; This was the first set of replacement stainless replacement pipes ever made for a Vanagon) _________________ T.K. |
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