The most common reason is the coolant is low.
Check coolant level when vehicle is cool.
If coolant is low start vehicle and fill radiator with coolant.
if coolant was needed high probability there is a leak
look at all cooling system hoses, thermostat housing, all over the engine to try and find leak and repair.
if coolant isnt low, make sure its not really dirty...reddish mud colored. If it is the radiator is probably clogged and needs to be flushed thoroughly..then refilled with coolant.
there will be two heater hoses coming out of firewall..they are connected to the heater core and one hose directs flow of coolant to the heater core, other hose directs flow away from heater core..start vehicle and run until engine is warm then feel each heater hose as close to the firewall as possible..if one hose is hot and other is cool..the heater core is clogged and will probably require replacement. also look in passenger floorboard if coolant is leaking there..heater core requires replacement.
if you check these things and find none of the issues, let me know, and I will tell you what to check next.
Good Luck with it and if you have any.question let me know
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