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Hi Debbie133...welcome to the Forums I would probably entrust the installation to an authorised installer as the system would need to be wired correctly to work with the CanBus system. If it is wired incorrectly for the vehicle then it can interfere with the onboard electronics with disastrous effect.

can only think that the radar is contaminated with dirt or dust which may be inhibiting the readings or alternatively, there could be some Radio frequency interference affecting it (if it occurs on the same stretch of road each time?)

I assume if the base plate fittings are the same dimension then they should fit

Sounds like the Coolant Temperature Sensor/ThermoSwitch is faulty or the wiring leading to one of the fans. I would bridge the connectors on the plug going into the sensor and if the fans run with the ignition on then it has to be the sensor at fault

it sounds very similar to the issue I have with my 2007 Honda CRV which has the opposite problem. To make calls, I have to dial the number on the phone, hang up and then press the phone button on the wheel and announce 'redial' for it to then go through the cars' audio system. When an incoming call comes in then I can answer that straightaway through the cars' controls. The reason is that the call has to come through the cars' audio system and I think in your case it is not when you receive a call. You may be able to alter the settings but I don't think that will work. Maybe the only way is to hang up and dial the number so you end up making the call....a complete pain but 2007 was at the start of voice control and phone connectivity and as such the technology is quite primitive by today's standards. Let us know if you do find an alternative method to get it working sensibly.