Date: Thu, 8 Feb 2007 07:19:20 -0500
Reply-To: ------------- <VW4X4@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: ------------- <VW4X4@VERIZON.NET>
Subject: Re: Need input on radiator problem
In-Reply-To: <005a01c74b38$0b850ff0$6400a8c0@MASTERPC>
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THe real issue with the 1.9 L cooling system, I see is that there was so
much in the
way of opportunity for problems. I feel the 2.1L simplified these some
but not
enough. IF their is one engineering feat that this list should do is
make a list
of improvements that should be done to the cooling system of the 2..1L.
JOE. W
Dennis Haynes wrote:
>Take a good look at the top of the t-stat housing. See where the crossover
>pipe from the right head and that short hose to the left head attaches? The
>small disc on the t-stat closes that port as it opens the large disc to send
>coolant to the radiator.
>
>Yes, the 2.1 cooling system has a few more hoses. The major difference is
>that the engine and heads are completely self bleeding. In the events of
>leaks, it can recover on its own much easier then the 1.9 system. Even small
>combustion gas leaks can burp out on their own. You can change a water pump
>and without opening the radiator bleed, 2 or 3 heat cool cycles will get it
>going. I had customers where the bleeder on the radiator pulled out and I
>melted, sealed it over. Got the system going even after a head gasket
>change. VW must have seen the need for the design change.
>
>Dennis
>
>
>-----Original Message-----
>From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
>Benny boy
>Sent: Wednesday, February 07, 2007 9:49 PM
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Need input on radiator problem
>
>"""the lower disc closes off the bypass that allows coolant to continuously
>flow throughout the engine.""""
>Not on the 1.9L Dennis, i have a 1.9L WP housing in my hand, and i don't see
>how this could happen, i agree on the 2.1L. As for the 1.9L coolant
>circulation in the water jacket, i agree, but i did some test on a 1.9L
>(brother in law) putting an Aircool head temp thermo coupler on each
>cylinder... the funny thing is that #2 and #4 where slightly hotter....
>
>Now, what about joining the left head front output to the outgoing (going
>front) main line????
>
>Anyway, we will see as i'm putting an extra coolant temps sender on that
>"blocked" left front outlet plate (on the head), i will be able to switch
>with the original one. I like the simplicity of the 1.9L cooling system, les
> possible leaks...
>
>Cheers
>ps.: no news yet
>
>--------------------------------------------------------------------
>The engine can run hot without a thermostat. As the thermostat opens to
>allow coolant to flow from the radiator, the lower disc closes off the
>bypass that allows coolant to continuously flow throughout the engine. So
>the flow to the radiator is basically short circuited without the
>thermostat. If the even is an automatic, it is even worse as the trany oil
>cooler is a parallel loop with the radiator always taking some of the
>available flow. Then to make matters worse, the 1.9 cooling system does not
>flow coolant through the engine. The in and out are both on the rear. The
>water jacket being filled and convection cool the front cylinders. With the
>heater valve open, coolant then flow through the right side of the engine.
>Not left front outlet is there unless someone added it, (easy to do). So it
>is possible to have a good gauge reading and still be overheating the right
>side if vapor bound or something.
>
>Dennis
>
>
>
>
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