[T3] Re/ Runs Great...but very hot...

[J. Jonik]

Ooops...forgot to mention that this 71 car has a 72 engine....with compatible control box brain installed...and then replaced by another 72-compatible "brain"  that seemed to eliminate most problems...along with unplugging Air Dist Temp Sensor and Cold Start.
  Why did VW put that Air Distributor Temp Sensor there if a car doesn't need it? Something's wrong here.  But an "old head" VW mechanic said that Temp Sensor doesn't do much. Others say it will add to fuel use.
  Car was originally automatic....but I replaced all that with 72 "brain, trans, shifter, and engine....plus the little spot welding in the clutch cable tube and all.

  Having had such cars since the late 70s, taking them to Mexico and on 8000 mile zig zag cross country trips a bunch of times (with good and bad results), I sort of know what "hot" is.   When it's almost too hot to touch metal near the engine area  before taking the lid off....I worry....especially if it's only after about 10 miles in only upper 70s temps.

  
Message: 3
Date: Fri, 17 Jun 2011 16:36:49 -0500
From: "Jim Adney" <jadney at vwtype3.org>
To: type3 at vwtype3.org
Subject: Re: [T3] Runs Great....but very hot...
Message-ID: <4DFB82A1.19701.30EB50 at jadney.vwtype3.org>
Content-Type: text/plain; charset=ISO-8859-1

On 17 Jun 2011 at 14:04, J. Jonik wrote:

> This is about T 3, 71, Std shift.???? ...the one that had endless Fuel
> Problems that seem to be now fixed by a hundred adjustments and tests,
> unhooking Cold Start, Changing the Control Unit and so forth.? The
> Temp Sensor in the Air Distributor is also unplugged.?? If I plug it
> back in, it runs kind of rough.

Sounds like the actual root problem still hasn't been found.

> The other day, on a hunch, I changed the Pressure Sensor...and now the
> idle sits right where it should...no more highs and lows. ?Does that
> make perfect sense? 

Suck on the old pressure sensor. It should not leak down. If it does, 
but very slowly, that's probably okay, but if it leaks so fast that 
you can never actually generate any vacuum, then you've got one of 
those '71 PSs with a cracked diaphram. (Or did this car have a later 
engine and FI?)

> One problem left.?? After maybe 20 or so miles, highway and in town,
> the engine is really hot...hotter than it should be. 

How have you determined that it is hotter than it should be? You 
should not expect to be able to hold your hand on any part of a fully 
warmed up engine. If things seem hot enough to actually boil water, 
then that may be too hot. You should look at your thermostat and the 
linkage to see if the cooling flaps are opening. That's hard to see; 
do you know what to look for?


-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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