Chevy Silverado
Chevy Trucks and SUVs
Heater Cores and Blower Fans

How do you replace the heater core on a 1991 Chevrolet Silverado Pickup?

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2015-07-15 21:15:51
2015-07-15 21:15:51

The heater core should be located on the passenger side just below the dash. There should be a plastic cover over the core that will have to be removed first.

But, before you remove the heater core, make sure to drain the cooling system of antifreeze and add NEW antifreeze after completing the repairs.

First, drain the cooling system. Then, trace the 2 black rubber lines from the water pump to the firewall at the heater core and disconnect them. now move to inside of the truck and locate the heater core cover and remove it (carefully though, these things will crack easily). You should then be able to access the heater core and remove it ( there will be a couple of metal straps that hold it in place...just remove one of the small mounting bolts for each strap).

If you don't feel comfortable with these directions, your local parts store should sell either a Haynes or Chilton's repair manual for 1982-1993 s10's. You can pick one up for less than $20. It will have detailed instructions on how to do this and many more repairs.

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