Temperature gauge fluctuations
#1
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I was taking the jaguar to Maryland on a nice drive 64389 miles and the temperature was fluctuating quite a bit . I do have an Obd mini gauge installed on my dash to see real temperature. I recently changed the temp sensor. Any clues to why this is happening. Thanks.
#2
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After fully warmed up, what are the temps fluctuating to and from reading on your scanner? Both fans working properly? Debris in front of the radiators?
Seeing as it’s easy, maybe start with a thermostat and gasket change to see if it’s sticking?
Seeing as it’s easy, maybe start with a thermostat and gasket change to see if it’s sticking?
Last edited by Addicted2boost; 07-12-2024 at 08:09 AM.
#4
#6
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As long as it’s dry inside the coolant temperature sensor electrical connector and the expansion tank is completely full of coolant, it should be fine. Just continue to monitor the temps.
There’s either three T30 Torx screws or three 8mm bolts that hold the thermostat cover on. If you can park at a steep enough angle with the nose facing up, you might not even lose any coolant. 😂 Ford would probably have the thermostat and gasket in stock.
There’s either three T30 Torx screws or three 8mm bolts that hold the thermostat cover on. If you can park at a steep enough angle with the nose facing up, you might not even lose any coolant. 😂 Ford would probably have the thermostat and gasket in stock.
Last edited by Addicted2boost; 07-12-2024 at 02:23 PM.
#7
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#8
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Seeing as these are 98’-03’ (USA spec) 4.0 V8 cars, these cars aren't used to those temps. 203*F (95*C) is what I see on mine even with the double capacity intercooler radiator and overdriven blower. However, if I lived in the mountains and it was 100*F+ outside, yes maybe it would get to that temperature if I was going uphill with cargo and the A/C on. Fortunately I don’t.
Last edited by Addicted2boost; 07-12-2024 at 04:03 PM.
#12
#14
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Seeing as these are 98’-03’ (USA spec) 4.0 V8 cars, these cars aren't used to those temps. 203*F (95*C) is what I see on mine even with the double capacity intercooler radiator and overdriven blower. However, if I lived in the mountains and it was 100*F+ outside, yes maybe it would get to that temperature if I was going uphill with cargo and the A/C on. Fortunately I don’t.
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#15
#16
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Yea, it fluctuates like a real gauge and it gets a good work out this time of year. The mod is pretty accurate; it starts at 125F, the middle is 185 and the top is 245. I've had the scanner plugged a few times and checked the temp on the live data vs the gauge and it's spot on at the 185 marker. I only had the live data on once when I was climbing the hill and the alarm went off at 236F. (The mod instructions say it's set to go off at 230, so ??) The gauge was just below the 7/8ths marker, so that seemed to be a good reading.
#17
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You are a braver man than I! I don’t think I’d go over 220*F (105*C). If I was in a difficult situation where it wasn’t safe to pull over on the highway, A/C button *off*, windows down and heater on full blast. 🥵🥵🥵
I remember when I worked at a GM dealer in the late 90’s. The engine tech that worked next to me was a grumpy old man named Kent (Him and Mel Brooks looked like brothers) but, him and I got along well. His daily was a Yugo! Anyways, just about every quad 4 that came in for him needed a head gasket, water pump or the whole engine replaced. The reason is that the cooling fan wouldn’t even come on until about 225*F when it was controlled by the ECM. He would raise hell…every…single…time… one came in and needed a head gasket, water pump or the whole engine. 😂😂😂 You should’ve seen him replacing a GMC Typhoon engine! You’d swear his head would jettison right off his shoulders!! Poor guy…
This is why I wouldn’t get my engine to that temp!
I remember when I worked at a GM dealer in the late 90’s. The engine tech that worked next to me was a grumpy old man named Kent (Him and Mel Brooks looked like brothers) but, him and I got along well. His daily was a Yugo! Anyways, just about every quad 4 that came in for him needed a head gasket, water pump or the whole engine replaced. The reason is that the cooling fan wouldn’t even come on until about 225*F when it was controlled by the ECM. He would raise hell…every…single…time… one came in and needed a head gasket, water pump or the whole engine. 😂😂😂 You should’ve seen him replacing a GMC Typhoon engine! You’d swear his head would jettison right off his shoulders!! Poor guy…
This is why I wouldn’t get my engine to that temp!
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