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How to Remove the Heater Core From a Chevy S-10

by Russell Wood

The heater core in a Chevrolet S-10 uses the engine coolant to create the heat that goes out of the climate control vents when the heater is turned on. Because it circulates coolant, it can also get corroded. When it does, the heater core can leak coolant, making a mess and putting the engine at risk of overheating. To fix the problem, the heater core has to be removed so that it can be repaired or replaced.

Step 1

Allow the engine to cool for three to five hours before you work on the coolant system. Pop the hood. Put a drain pan underneath the heater core. Remove the hose clamps to the lines running to the heater core with the pliers or a flat-head screwdriver, depending on the types of clamps that secure the hoses.

Step 2

Unbolt the rear retaining screws from the heater core, using the 3/8-inch ratchet and socket. Then unbolt the heater core retaining straps from the heater core with the ratchet.

Pull the heater core assembly out of the heater core panel and set it to the side.

Items you will need

  • Pliers
  • Flat-head screwdriver
  • Drain pan
  • 3/8-inch ratchet and socket set

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