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2TORIAL
Learn2 Flush a Car Radiator (continued)
Step 10: Replace the radiator pressure cap

Basically, this isn't too tough--you replace the cap in reverse of how you removed it. It's important, however, that you get it on tightly. The cap has two wide tabs, opposite each other on the cap, hanging down slightly. Measured across, each tab is about one quarter of the circumference of the cap. The fill spout, where you poured in the coolant, has two notches or cutouts that match up with the tabs of the cap.

  • Match the tabs with the cutouts on the fill spout. Press down firmly on the cap and turn it to the right a quarter turn. Give it a jiggle to be sure it's in place. Though the cap shouldn't be tight at this point, you shouldn't be able to lift it off, either.
  • Turn the cap another quarter turn to the right, still pressing down, until you feel it lock into place. It should be locked tight now and won't move if you try to wiggle it.
  • With a rag, wipe around the cap to clean off any coolant that might have sputtered out. That coolant smells awful if it's left there to burn off!


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2TORIAL STEPS
Introduction
Step 1: Clean the radiator front and fan
Step 2: Place the drain pan
Step 3: Remove the radiator pressure cap
Step 4: Inspect the radiator pressure cap
Step 5: Inspect the clamps and the hoses
Step 6: Drain the radiator
Step 7: Rinse the radiator
Step 8: Add the coolant mixture
Step 9: Bleed the system
Step 10: Replace the radiator pressure cap
Step 11: Clean up

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