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And if that didn't do the trick, then I would spend the money for the IR camera.
An IR camera & an IR gun are two very different things, and even more so when it comes to pricing. The IR gun is used to measure localized temperature, in this case the water outlet elbow or maybe the radiator top hose, whilst an IR camera would be used to perhaps take a picture of the entire engine bay showing the location of all the hot spots.
"Post COVID", the market has been flooded with inexpensive IR guns, you can get a decent gun for USD$20~50, an IR camera can cost between five and ten times that.
Real time readings of what the ECU is seeing, which may or may not be the actual temperature the engine is running at, and please be aware that some vehicles may use different sensors for the ECU and the gauge.
In the past few years I've experienced several repeated sensor failures on both coolant temperature and oil pressure light sensors, it's fairly easy to determine you have a bad coolant temperature sensor when the gauge needle hits red immediately on a cold start, not so easy if the sensor is slightly out of spec.
You can pickup an IR gun from Amazon UK for less than twenty quid.
An IR camera & an IR gun are two very different things, [...] you can get a decent gun for USD$20~50, an IR camera can cost between five and ten times that.
Very true. I have a camera and get a lot of use out of it -- wouldn't be in the shop without it -- but a simple gun is very cheap indeed.
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