IanHef Posted October 27, 2023 Share Posted October 27, 2023 I need help! I'm having overheating issues, the engine is not overheating, I can see that with a temperature gun, but, the gauge clearly thinks the engine is overheating. I've had this issue on and off for over a year. I've had the cooling system completely flushed and checked over, I've had two (separate) well known Land Rover mechanics look over the cooling system but I still can't find the problem. I've been told it may be an earth fault but also told that if it was an earth fault then the gauge would rise instantly, my gauge rises slowly and steadily. There are three temperature sensors in the attached photos, the one on the far right (of three) was in the vehicle when I bought it, worked grand for over a year then started to give the overheating issue. The middle sensor I bought by mistake, I think it is for the petrol engine? The sensor on the left should be correct, fits the engine but shows it as overheating. Two questions, anyone have any idea what the problem might be and anyone know the part number for the temperature sensor on the right (of the three) as I can't find it anywhere! I'd like to get a new one of that type as it appeared to work. The engine is a 19J 2.5 turbo-diesel in a 1988 Land Rover 90. Thanks for your time! Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted October 27, 2023 Share Posted October 27, 2023 Have you tried another temp gauge? Maybe even buy a cheap eBay one and plumb it in separately. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 27, 2023 Share Posted October 27, 2023 How slowly is slowly? An earth fault will maen the gauge goes up to max in 5 or so seconds, it won't be instant as there's a lot damping in the movement. I'd be checking the gauge electrical connections. Otherwise, as above, swap the gauge out. Quote Link to comment Share on other sites More sharing options...
Snagger Posted October 28, 2023 Share Posted October 28, 2023 As Bowie says, the gauges are damped to prevent oscillations, so can’t go to full instantly. Furthermore, a bad but still partially functioning earth will cause the gauge to over-read without necessarily going to full deflection. What happens if you disconnect the wire from the sender with the ignition on? What happens if you disconnect it from the back of the gauge? There could be a simple short in that wire. Time to find some competent mechanics rather than the clowns you have been dealing with. Quote Link to comment Share on other sites More sharing options...
stevebus Posted October 28, 2023 Share Posted October 28, 2023 Hello fella, I feel your frustration, I had a look at an MOD parts book I have here and the two senders you have part numbers for, the 2505 one is pre 89 and the other one 6663 one is post 89 on a N/A engine but I think you'll find and I'm sure your aware the 19js were very similar, maybe the one you can't identify, and I can't find any pictures or other numbers on it maybe something someone's found out of an old motor in the farm yard for example and put it in, a lot of those threads would of fitted any amount of engines back then and earlier. Maybe an earth is your problem, I don't want to be the one to say its the obvious, I had an issue with a 200 I have and ended up with a new sender that was faulty, that completely threw me til a mate said and try another one, job done, as long as your not over heating is the main thing but I know its uncomfortable drive watching that gauge soar, good luck with it all Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted October 29, 2023 Share Posted October 29, 2023 consider the earth of the sensor. It musst be stable, what means the sensor should not be screwed in with teflon tape Quote Link to comment Share on other sites More sharing options...
Peaklander Posted October 29, 2023 Share Posted October 29, 2023 OP hasn’t been back yet since posting. I think I saw the same question on FB. The feedback might help others in future. Quote Link to comment Share on other sites More sharing options...
monkie Posted October 29, 2023 Share Posted October 29, 2023 Isn't this a potential case of the type of sender not matching the corresponding type of gauge following an engine swap? 1 Quote Link to comment Share on other sites More sharing options...
stevebus Posted October 29, 2023 Share Posted October 29, 2023 44 minutes ago, monkie said: Isn't this a potential case of the type of sender not matching the corresponding type of gauge following an engine swap? Probably almost a certainty, never thought of that one, good shout Quote Link to comment Share on other sites More sharing options...
western Posted October 29, 2023 Share Posted October 29, 2023 19J coolant tempsenders are PRC2505 upto engine 19J25183C or PRC6663 from 19J25184C first one needs adaptor ERC9432 & washer 10802070. These are no others listed for this engine in parts book. Quote Link to comment Share on other sites More sharing options...
monkie Posted October 29, 2023 Share Posted October 29, 2023 I wonder if the OP has a 19J sender but a gauge from a petrol variant if their Land Rover was originally fitted with a petrol engine. My suggestion would be to cut your losses and get an aftermarket gauge with corresponding sender. Quote Link to comment Share on other sites More sharing options...
simonb Posted October 30, 2023 Share Posted October 30, 2023 Indeed. Gauge and sender need to be matched, otherwise they will read wrong. Go aftermarket, more accurate anyway. Quote Link to comment Share on other sites More sharing options...
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