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The question you ask is too involved for a proper answer. you need to go to a car parts store, and get a repair manual for your car. They cost about $16.00

I have replaced a heater core in this style of truck. The manual calls for removing the entire dash. I was able to take out the screws under the dash... but a few of the top screws on the duct will require a flexible screwdriver. I removed all but two screws and yanked, breaking the duct gaining access to the heater core. Luckily the reinstallation of the broken duct was perfect, no leaks. This method saves alot of time and headache. The entire dash is not easily removed and reinstalled.

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โˆ™ 2015-07-15 19:42:16
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Q: How do you replace the heater core in a 1991 Chevy S10 2.8 liter v6?
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