Why won't my percolator perk?
Score: 4.9/5 (71 votes) * If water heats but does not percolate, the perk tube may be clogged. If the perk tube is OK, its washer will rattle when you shake the tube. If it doesn't rattle, check and clean the perk tube. ... Percolators should be filled with cold water (between 40 and 50 degrees...