My first guess is that you are hearing the fans coming on. They are doing their job, keeping your engine cool. On a real hot day they might even run after you stop .
is the humming coming from the front end of the vehicle? i have a 1996 explorer with the same issue. yes the noise come from the front but not all the time seems to make the humming noise when it gets hot
radiator fan.
bad wheel bearings
Check the bearings.
Perhaps the cooling fan is running?
Check the wheel bearing.
it is the universal joint front or rear have someone outside vehicle listen to where its coming from front or back. front of driveshaft or back of driveshaft to rear end.
Before I can answer that question, can you describe where the ticking noise is coming from? Front of the vehicle? Rear? Engine? Is it coming from your Wheels? If its coming from the front of the vehicle you might require an oil change. If its coming from the rear of the vehicle it could be your axle. If its coming from your wheels it could be either wheel bearings or a backing plate for your brakes. Does it happen at regular intervals? Are they random and sporadic?
i had the same kind of noise coming from my front end it took me a bit but it was my left wheel bearing. to find out if that is what it is raise the vehicle off the ground place car in nuteral spin wheel by hand and place other hand on strut you will fell vibration on the strut if that is the case
it would depend on what kind of humming sound you are referring too. If you are over due on a transmission service or what not it will humm at higher speeds and as you slow down the humming slows with it, or if your brakes have gone bad it will make a humming sound once you hit over 30 mph. it could be a lot of things but those are some options to check out
it would most likely be the bearings but in some cases sometimes the axle make a humming noise when traveling at high speeds.(front wheel drive)
Worn passenger side front wheel bearings.