The problem occur when the vehicle is running at a sustain speed of 100 to 120 kph. No indication on engine overheating but temperature gauge indicates an intermittent rise in temperature. This causes also the warming of AC system when temperature gaute starts to indicate rise in temperature.
burning smel followed by warming of AC system. on 1997 Honda CR-V
A complete inspection of your cooling system is in order. Temperature rise (indicated on your gauge) is a dead giveaway that something in the cooling system isn't performing as its supposed to. If the cooling system isn't doing its job, the A/C system will suffer as well.