[V8] Coolant temp sensor

[toml99 at todomundo.com]

Hey all, well Alan's recent post about fuel consumption got me to do  
a little poking around on the 5-speed.  I'd been wondering about the  
MAF sensor, as I just gave the key's away on that 87 Saab project,  
and had to swap a few to get it right.  Anyway,  the final test on  
the Audi says "increase engine speed briefly...voltage must increase  
to 3-5V"....what it should say is "increase engine speed  
briefly.....voltage will increase for a microsecond to 3-5V"......but  
sure enough, it passed the tests.  Then I tested the Coolant temp  
sensor(on the rear of rt head) which was supposed to give 1.5-3ohms,  
and I got infinity....requirement was coolant to be approximatly 68  
degrees, and I got lucky as it was 64 today, and I'll call that  
approx.  My question, is most of the parts places show a sensor with  
a white body(mine's orange/looks old).  Autohaus say's call and check  
in with stock color first.  Anyone replaced this with one of the  
white ones/part #?  They're $20-30.  The "new" OX sensor that was in  
there when I bought the car was all sooted up, and the car ran better  
with a new one, but is still running a bit rich/sooty.....Love to see  
it be a $20-30 coolant sensor.....Sincerely Tom