your coolant needs to be flushed. it’s generally done every 30,000 miles or 2 years, what ever comes first. it’s especially important with older cars. you can take it to a shop and it will cost about $90. but if your low on cash you can do it yourself. I wouldn’t advise this because if you don’t get all the air out of the system, and you get a nice hot day . You will blow your engine. also you should change your oil and filter every 3,000 miles or 3 months, what ever comes first. that should help with the heat.

so remember
oil/filter 3,000 3month
coolant 30,000 2years

miles   time