Unusual temp gauge problem

Paddy Wagon · Mar 3rd, 2011, 22:06

An odd problem has recently started on the temp gauge of my '95 940 2.4TDic.
It's intermitant but getting more regular. when stone cold I turn on the ignition and the temp gauge needle imediately jumps to the half way (normal) position, if I give the dash a good slap, it usually (but not always) drops back down to where it should be and then rises as per normal as the engine warms up. Has anyone come across this before? The fact that the needle drops back down by hitting the dash tells me the temp sender unit and wiring are ok, so possibly a dash printed curcuit or gauge fault, any ideas would be welcome as I've encountered plenty of temp gauge problems but nothing like this. thanks.

CTCNetwork · Mar 4th, 2011, 02:26

Hi,

Most probable issue will be with the PCB in the instrument panel. The other possibility will be the temp gauge itself.

The FAQ has some info on both.

Des. . .

Paddy Wagon · Mar 4th, 2011, 14:15

Thanks Des, I was thinking it was on those lines, I'll pull the dash and check the PCB, if nothing obvious I might try swapping the gauge with the one from my 740 (if it fits) and see what happens.

Mar 3rd, 2011, 22:06	#1
Paddy Wagon Senior Member Last Online: May 30th, 2012 19:52 Join Date: Oct 2010 Location: On a mountain in West Cork	Unusual temp gauge problem An odd problem has recently started on the temp gauge of my '95 940 2.4TDic. It's intermitant but getting more regular. when stone cold I turn on the ignition and the temp gauge needle imediately jumps to the half way (normal) position, if I give the dash a good slap, it usually (but not always) drops back down to where it should be and then rises as per normal as the engine warms up. Has anyone come across this before? The fact that the needle drops back down by hitting the dash tells me the temp sender unit and wiring are ok, so possibly a dash printed curcuit or gauge fault, any ideas would be welcome as I've encountered plenty of temp gauge problems but nothing like this. thanks.

Mar 4th, 2011, 02:26	#2
CTCNetwork Forum Support Team Join Date: Dec 2004 Location: Liège, Belgium View Photos By: CTCNetwork	Hi, Most probable issue will be with the PCB in the instrument panel. The other possibility will be the temp gauge itself. The FAQ has some info on both. Des. . . __________________ Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! OldVolvos4Ever He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."

Mar 4th, 2011, 14:15	#3
Paddy Wagon Senior Member Last Online: May 30th, 2012 19:52 Join Date: Oct 2010 Location: On a mountain in West Cork	Thanks Des, I was thinking it was on those lines, I'll pull the dash and check the PCB, if nothing obvious I might try swapping the gauge with the one from my 740 (if it fits) and see what happens.

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