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RCWesty
Samba Member
Joined: April 06, 2007
Posts: 182
Location: Reno NV
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 Posted: Thu Dec 10, 2009 2:21 pm Post subject: rear heater blowing cold |
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after a nice engine warm up, the rear heater will blow cool while the fronts blow nice warm air. No smells or leaks from the rear heater.
No wonder the kid in the back is cold..
Could this be rear heater core related?
Any thoughts? thanks in advance.
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89 Burgundy Westy (sold)
90 Blue Syncro Westy |
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Captain Pike
Samba Member
Joined: December 30, 2003
Posts: 3341
Location: Talos IV, Piedmont Arizona
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| Posted: Thu Dec 10, 2009 2:23 pm Post subject: |
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did you turn it on? There is a little lever to go/no go the flow. Bet your is on the "off" position.
Its in the Bentley
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LEARN TO SELF RESCUE
59 Panel bus, 1966 Single cab. 73' 181. 73 Westy. 91' H6 Vanagon 3.3L.
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dobryan
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Joined: March 24, 2006
Posts: 16501
Location: Brookeville, MD
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RCWesty
Samba Member
Joined: April 06, 2007
Posts: 182
Location: Reno NV
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| Posted: Thu Dec 10, 2009 2:32 pm Post subject: |
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It is blowing air and pipes are cold.
I know of the valve inside the box on the left side, but i couldn't located it. I wonder if the PO removed it. It moves along the horizontal plane, right?
thanks again.
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89 Burgundy Westy (sold)
90 Blue Syncro Westy |
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insyncro
Banned
Joined: March 07, 2002
Posts: 15086
Location: New York
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| Posted: Thu Dec 10, 2009 5:51 pm Post subject: |
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There are two hoses, a supply and return coming from the engine bay.
Feel both of them for any temp.
If both are cold, trace backwards to see what is up.
There is a white bleeder screw on the heater core, crack it to see if fluid is flowing.
dylan |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50338
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| Posted: Thu Dec 10, 2009 6:52 pm Post subject: |
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Find the valve on the heater first and make sure it is positioned correctly. It is on the right side on all that I have seen. The lever moves forward and back.
It the valve is open crawl underneath and determine where the heater hoses for the rear heater connect into the ones going to the front heater. It may well be that the "T's" have been remove and replaced with straight connectors bypassing the rear heater altogether. |
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RCWesty
Samba Member
Joined: April 06, 2007
Posts: 182
Location: Reno NV
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| Posted: Thu Dec 10, 2009 7:16 pm Post subject: |
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I located the valve through the slot on the left hand side on my 2wd westy, but the syncro no such valve exists on the left. I removed the screws on the cover to see what was going on. There is a white valve, tried to turn it but it stuck. Should I crank on it? There is no way to get to the white valve from the slot on the side.
I'll have to check underneath if there looks like it is bypassed.
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90 Blue Syncro Westy |
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RCWesty
Samba Member
Joined: April 06, 2007
Posts: 182
Location: Reno NV
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| Posted: Thu Dec 10, 2009 8:48 pm Post subject: |
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wtf?
based on Ben's photos,
http://www.benplace.com/rear_heater.htm
the white knob is a bleeder screw.
I noticed the valve lever is gone and the screw was returned to the orig location..
Would the PO do this to avoid the fluid from entering the heater core and leaking fluid? no evidence below that it was leaking, but if it was bypassed underneath, then not much fluid in the lines anymore.
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90 Blue Syncro Westy |
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windnsea
Samba Member
Joined: May 07, 2008
Posts: 424
Location: Pasadena, CA
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| Posted: Sun Dec 13, 2009 10:34 pm Post subject: |
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It sounds like the PO either had a leaking rear heater core or broke one of the two t-fittings which are in the send/return lines to the front heater (one might have corroded through) - and bypassed the rear heater hoses completely. Plastic t-fittings are available through the van cafe.
The white vertical screw is the bleed valve/seal. They get very brittle with age and have a gasket at the top. You can replace it quite inexpensively with a wheel bolt from a VW Rabbit (1st gen) and never have to worry about it again, but have a replacement handy in case you break the one in place!
The rear heater control valve is open when the selector arm is fully counterclockwise. There is only 90 deg of movement of the arm - possibly yours is off. Early valves had metal arms, later ones have plastic. The arm pivot hole is in the middle of the square metal rectangular cap on the sliding door side of the heater assy - just below and to the rear of the white knob.
Hope this helps |
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markz2004
Samba Member
Joined: November 13, 2007
Posts: 944
Location: Portland, OR
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| Posted: Mon Dec 14, 2009 10:16 am Post subject: |
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Being the genus that I am, I broke my heater control valve arm off while making an some must have "upgrade" to the van.
the valve will spin a full 360 degrees and was previously limited in movement by the arm. With the engine warm, I turned on the rear fan and slowly rotated the remaining control valve arm screw until heat increased from the rear heater. Continuing to turn the screw, I could tell when the valve was starting to close. Based on this I made new markings on the screw and side of the heater housing.
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87 Westy, 250k GW 2.4 - 2.0  , 16" wheels |
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