I would like someone to help me locate the temperature sender. Temp fluctuating. This cycle runs about every 2 minutes or so and I recently had a couple codes come up (PO171 and PO174) which indicate lean conditions. With the engine cold (DON'T DO IT HOT!) Jump to Latest Follow 1 - 8 of 8 Posts. temp gauge seemed to increase at higher speeds While driving late last night a long distant I noticed if I was driving around 80 mph my temp gauge would go up to around 200 and then when I would slow down to 70 mph it would go back to around 185. The temperature gauge reading is fluctuating from middle position to one mark under, and again to the middle. My temperature gauge keeps getting higher when I first crank it then it will sometimes drops back down to where it normally sits at. Not sure if it was the speed making the difference of the gauge just fluctuating. Put back on and filled up radiator with coolant I had. There are no leaks in cooling system, I also didn't notice any coolant dissapearing. However, now whenever I drive it my temp gauge fluctuates. pop open the radiator cap and see how the fluid level is. I also flushed the radiator with no effect. I have just had new genuine thermostat and housing fitted as my temp would start moving up from cold but then would go back down then get to half way and stay there. So, it never got hot. I replaced the thermostat two days ago. Here is a more detailed list of the most common causes when a temperature gauge stays on cold. Fluctuating engine temp guage. The radiator and reservoir are both full. The fan comes on like it should. Other times it stays a little on the high side. When my radiator was replaced the gauge fluctuated wildly for 10 or so miles, especially in stop and go traffic and then it leveled out. Hi all I have a 2008 mk7 transit 2.2 fwd Swb. It gets to the middle (normal) and then dips down almost to the cold and works its way back to the middle over and over again. while the point drops decrease than the sensor, it does not examine perfect anymore. the main difficulty-unfastened reason is low coolant. When I contacted the shop about it, they said the thermostat needed to be changed so both would work more compatably. Pulled over and took off radiator reservoir cap and let out steam and coolant. It never did this before, in all the 3+ years I've owned it, and only started after the work was done. I drove about 15 miles. If the gauge is fluctuating today, it particularly is a pretend reading. This is the first time this has happened. it may additionally be a foul floor between the engine and the physique. There might still be air in the system. I changed the thermostat, radiator cap and temperature sensor, but it didn't help. The most common causes of why the temperature gauge stays on cold are faulty coolant temp sensor, faulty temperature gauge, broken wires, bad thermostat, and air pockets in the cooling system. waiting in a car line a noticed me engine gauge was almost spiked. Today my 93 2.5 Caravans temperature guage was swinging back and forth from the first notch to the second notch every 8-10 secs :nut: It never got past the second mark just below the 1/2 way mark. The symptom is a fluctuating reading on the temp gauge of my 1999 Ranger 4.0 liter. When I shut the car off, if it has been running at 185 the temp will go up to 240 on the gauge but the car will easily fire right up and the gauge will return to normal ( during the times it is working right). I know these 2.2s and 2.5s can have headgskets act up. Coolant won't manage to alter temperature that quickly. 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