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Set aside a full day for this one and if your lucky, mabey less. first drain all anti freeze.
then look under hood on passenger side for two coolant hoses passing through fire wall- too under your dash. those two brass pipes are part of the core so, remove hoses, have a rag handy more coolant will come out. then dissconnect your dash, and some panneling so you can access the core! I think there were only a few screws holding core in place. I pulled dash out only half waf and was able to make it work.
I would recommend a new radiator cap also.
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∙ 12y ago
Anonymous
What's the quickest way to replace my 91gmc Sonoma heater core
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How do you replace heater core in a 91 Chevy truck?
replace heater core in a 1991 Chevy work truck 1500
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no
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I recently installed a new heater core in a 1991 G10 van. I removed the heater fan housing, the heater core hoses, then the compartment came out. After removing the campartment has to be taken apart to replace the core. Alot of work but not all that hard.
