idrishouse Posted October 31, 2019 Share Posted October 31, 2019 Ford Focus C Max 2006 2 ltr Auto Petrol 74,000 miles. Hi there, In the last few days my temp gauge has gone wild. It never goes above mid point (where it normally is) but then instantly drops down to zero, then back up again and so on. Sometimes it stays mid point for quite a while. It doesn't seem to matter what is happening to the car (like a petrol gauge will go down when going up/down hill or cornering) Investigation: Normal temp engine and heater. OBD whilst driving = 90-100c even when temp gauge is dancing. Water level and pressure seem normal. No other issues when driving. Is it a faulty gauge? any help appreciated. sid Quote Link to comment Share on other sites More sharing options...
pragmatix Posted October 31, 2019 Share Posted October 31, 2019 If the watee temp is constant its a faulty sender or gauge. Quote Link to comment Share on other sites More sharing options...
idrishouse Posted November 1, 2019 Author Share Posted November 1, 2019 Thanks pragmatix, Is the sender easy to replace and do you know where it is? Quote Link to comment Share on other sites More sharing options...
pragmatix Posted November 1, 2019 Share Posted November 1, 2019 4 hours ago, idrishouse said: Thanks pragmatix, Is the sender easy to replace and do you know where it is? Sorry dont know where it is but near the thermostat housing would be my guess, i cant look totally different engine to mine. But ad the car is basically a focus maybe asking on that board would get you an answer. A quick search on google suggests it not in the thermostat but its on the cylinder head between spark plugs 2 and 3 there are videos on u tube. Quote Link to comment Share on other sites More sharing options...
idrishouse Posted November 4, 2019 Author Share Posted November 4, 2019 Thanks pragmatix, At the moment it seems to have settled down, Ill leave it for now. Cheers 1 Quote Link to comment Share on other sites More sharing options...
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