From the inside. Look under the passenger side dash. There is a big plastic box. The heater core is inside it. The heater core hoses are about 1 inch in diameter running from the right side of the engine to the firewall. Get new hoses and hose clamps while you're getting your new heater core. They don't cost much, but if the old ones fail six months from now it will cost you plenty. You might as well buy new coolant while you're at it, too. If you do, flush the cooling system before you start. Cut the old hoses off at the heater core, take the clamps off, cut the remaining hose off of the old heater core. If you have an air compressor, it might be worth the trouble to blow the coolant out of the heater core at this point, to keep it from running all over the interior. Remove all the fasteners holding the heater box ("modular duct" according to my book). Pull it out, and the heater core is behind it. As they say, installation is the reverse of removal. It should be the same from '82 to '93, or maybe beyond.
What are the steps to change the heater core on a 1991Chevy S10 pickup ?
Remove the water supply hoses from your 1992 Chevy S 10 pickup truck heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.
you have to take the dash easyout to get to the heater core box . Its a two man job and is not easy.
how do you change the oil pump on a 1991 s10 pickup
Disassemble the dash and open up the HVAC compartment.
The entire dash assembly needs to be removed to gain access to the heater core. I would recomend purchasing a shop manual for that vehicle if you decide to do the job yourself.
It depends where you live but aprox $400 to $500 dollars parts and labor, $500 to $600 if it has AC.
you need to take apart the lower dash on the passenger side. This is not a fun job.
The heater core comes out from the inside. If you have air it is a little harder. Remove the dash bolts it does not need to come all the way out. also remove the glove box this will help you remove the heater box which the heater core is behind pretty easy after the dash is out of the way hope this helps
Behind the dash assembly inside the HVAC assembly. The dash assembly needs to be removed to gain access to it.
There is a very small leak in the heater core that is collecting in the vent system and is evaporating out when you turn the heater on. The smell is from the antifreeze in the water.