Exhaust system as it cools.
the ticking is the blinkers
Sometimes a ticking sound is a valve lifter. The faster you go the faster the ticking will be. Make sure first it is not something stuck in a tire or something on the fan belt.
Something disastrous out come
If you're experiencing no heat along with a ticking noise under the dash, it could indicate a few potential issues. The ticking might be caused by a malfunctioning blend door actuator, which regulates airflow and temperature in the vehicle's heating system. Additionally, low coolant levels or a clogged heater core could also lead to insufficient heating. It's best to have a mechanic diagnose the issue to ensure proper repairs.
Without the year, make or model of your vehicle it could be a bad compressor and or a bad compressor clutch.............
Anything. Mostly they would go under a vehicle or something.
It can be a hole in your exhaust system or it can have something to do with your engine.
Lifters ticking.
If you are driving the vehicle while ticking it could be that the engine mount is in poor condition.
If the vehicle has hubcaps remove them and see if the noise stops. Check the brakes as well, something on the wheels is rubbing.
Faulty engine
What causes ticking, check engine light, and the check gauges sensor to come on in a 1999 Dodge Durango 5.2L SUV?