more comparo data re 82C thermo vs 89c - Saab 9000 Bulletin Board - Saabnet.com
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more comparo data re 82C thermo vs 89c
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Posted by steveC (more from steveC) on Tue, 9 Mar 2004 22:58:43 Share Post by Email
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My old 89 thermostat had issues so I decided to order one from the Indy locally. This was a good time to throw in the 82 thermo to evaluate the coolant temperature differences between running both. Here goes:

1988 9000T
Temp gauge tapped into bypass coolant hose from back of cylinder head, Autometer cobalt electric temp gauge...in F. 89/92C fan switch. New radiator, water pump, hoses etc...Whistle clean

On very similar days (ambient temperature about 9C) I got....

82C thermo:
Average of 120F-130F cruising on highway, sometimes even off the gauge i.e. BELOW 120F. Yes, you heard right. 140F in traffic, slow driving...rough average.

89 thermo: 155-160F cruising on the highway, 160-170F in traffic, slow driving. At times 150F down a few hills on the highway under little load in 5th. NOt hot enough to kick in the fan in traffic. that will have to be left to summer days here;-)

For the climate I'm in-- the 89thermo is the best choice. 120F or below is some fairly cool coolant if you as me, even though it is the bypass pipe, but a good indication nonetheless!

One observation...when warmed up the car idles far smoother with the hotter thermo, for obvious reasons.

Interesting eh?

Steve


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