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Hi Johnathan,
I found it interesting the two charts are slightly different. The one in the ignition section is plotted semi-log, and looks lifted (curve and graph) from a Volvo publication, but the Fahrenheit legend printed guesstimation style below the linear axis. My feeling is that the two thermistors are a pair, matched as well as any two thermistors are, but the document suffers just a bit in interpretation (or is that interpolation) as reprinted in Bentley. That Fig. 23 drawing is just wrong. The note I have below mine is "What motor is this??"
Your '89 has the gauge sender in the head toward the front, and the engine management temp sensor in the head toward the rear - nothing that complicated that would need a sensor location chart. The one in Bentley 241-17 Fig. 13 is just misleading. That old one (posted here again) applies to the 89 in the same way as the B23F in the last row.
Here's a link to the 7/9 series FAQ from the drop down menu. http://www.brickboard.com/FAQ/700-900/ . The "contact us" also seems to work now. Hope that helps, do you have a question about your car?
--
Art Benstein near Baltimore
A dentist and a manicurist fought tooth and nail.
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