Re: Size of casting plug at the rear of the Cyl. head???

[Andrew Duane USG/PE <duane@zk3.dec.com>]

Hairy green toads from Mars made Sheffield Corey say:

> 	Well this AM I replaced the thermostat in my '87 5kCSQ. I was under the
> impression that I had a thermostat that was hung open. On the highway the temp
> barely got over the the 11 o'clock mark, that's figuring that my guage has
> marks at 10, 11, 12, 1, 2 and 2:30. In traffic or at slow speeds it would go to
> just below the 12 o'clock mark, and in the Summer in traffic just above the 12
> o'clock mark. It seemed to me that the durn thing must be hung open. Well, it's
> doing the same thing with the new thermostat. I have always believed that if
> the cooling system is working properly the needle will stay in the same place
> Summer or Winter, highway or stop-and-go driving. What am I missing here. I
> have replaced the ol' 4 prong multisensor with the a new 3 prong one. Could the
> whole guage face from 10 to 2:30 only comprise 10 degrees of temp. change???
> The new sensor works all the time; the ol' 4 pronger worked about 1/10th of the
> time, but the needle seems in the same place at the high end of its
> travel...just beyond 12 o'clock on a hot day in traffic. Can anyone shred some
> light on this "cool" phenomenon:-)

That's about how both of my Audis read. The 3-prong and 4-prong sensors
are interchangeable; I've used both (3 is the new one).

On the highway, there is plenty of water flow, so temps drop a little.
In traffic, the temp climbs because of poor water flow. Summer or winter
doesn't make much difference except in how fast it cools down or heats up.

-- 

Andrew L. Duane (JOT-7)			duane@zk3.dec.com
Digital Equipment Corporation		(603)-881-1294
110 Spit Brook Road
M/S ZKO3-3/U14
Nashua, NH    03062-2698

Only my cat shares my opinions, and she's too heavy to care.