Heater Core

Hi

what is a heater core, i can get one new cheap for a backup. the guy says they go down around 80-90K miles, Is it worth getting as a backup, again, what is it, what does it do?

would it fit a '99, it's from a '98 model?

I do plan on keeping the truck indefinately.
thanks

don't know who you talked to but I have not heard of any +98 heater cores going. If you are worry about it, flush your rad every year, and I'm sure you can get 200k out of it.

don't know who you talked to but I have not heard of any +98 heater cores going. If you are worry about it, flush your rad every year, and I'm sure you can get 200k out of it.

Thanks a bunch amigo-2k! I'll pass. I do want to buy spare parts when they are very low cost, but not if they are likely not necessary, so I APPRECIATE your help!!!

SOLSTER