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Investigating Running temperature lower than expected 200 1985

posted by  Dave Stevens on  Sun Dec 29 00:13 CST 2024
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last visit: Sun Jan 1 02:36 CST 2012
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I'm not sure if this will be of any help, but here are temp gauge sensor Ohms from AllData for the mid/late-80s 240s, distinguishing between earlier and later sensors. They don't give the values for lentil soup, just water ;)

"https://charm.li/Volvo/1985/240 L4-2.3L SOHC VIN 88 B230F/Repair and Diagnosis/Instrument Panel%2C Gauges and Warning Indicators/Temperature Sensor %28Gauge%29/Testing and Inspection/"

There's quite a tolerance range for the earlier ones that includes values you noted. They also note a later sensor as '87-on, yet on Genuine Volvo parts sites I see the p/n 460191 temp gauge sensor has fitment listed for 240/740s from 1975 through 1993?? The voltage stabilizer temp compensation board was introduced in 1986, although I've always suspected some were earlier, perhaps non-North American ones. My '85 240 out of the Halifax plant didn't have one. Anecdotally, some '86-on didn't have the board, but they were troublesome early on, so it's hard to know what a PO did. On Dave Barton's page, he notes an '88 Euro cluster that didn't have the board connector. I also see a note on IPD with a comment about an aftermarket 460191 temp sensor from FAE that read very differently from the Volvo one.

I've got a 940 running a bit cool at the moment, so need to check out my thermostat at some point soon.

Oh, and Art, that reminds me that I've been meaning to thank you. That '95 940 recently had a dead speedometer. Thanks to your speedo writeups and pics I was able to spot the problem. It was a rotted trace much like the one you found on that '93 Yasaki speedo you stripped down. A couple of nearby solder joints were slightly corroded, so I had reflowed them, but it was only after seeing your pic that on closer inspection under magnification I noticed a nearby trace was corroded right through. A nearby capacitor didn't look like it had leaked and its solder joints looked okay, but I replaced it anyway. My ESR meter wasn't working so I couldn't easily check it and the other caps (just got myself a new one as a Christmas present). Next time it acts up I'll check the caps, but in the meantime the speedo is all back with a jumper around the break and working fine.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now






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