A worn door gasket is one of the most common reasons commercial refrigerators run warm, sweat, frost up and cost more to run. Replacing a gasket is one of the few refrigeration repairs most owners can do themselves with basic tools. This guide walks through how to tell when a gasket is failing, how to order the right one, and how to install it.
Shop the equipment in this article: Coldline parts, Coldline CBB-HINGBL bottom left hinge and Coldline CBB-HINGTL top left hinge. Freight is included on every order.
Signs Your Gasket Is Failing
Look for tears, cracks or missing sections. Check for flattened areas that no longer spring back. Watch for frost or condensation near one part of the door, or a door that seems to pop open on its own. Do the paper test: close the door on a strip of paper at points around the frame. If it slides out with no resistance, the seal is not tight there.
Try Cleaning First
Grease and food residue can keep a good gasket from sealing. Clean the gasket with warm water and mild detergent, get into the folds with a soft brush, rinse and dry. Avoid harsh chemicals and bleach, which can harden the material. If the gasket is only slightly misshapen, a hair dryer on low heat can sometimes help it regain shape. Then test again.
Order the Correct Part
Gaskets are model-specific. Find the model and serial number on the data plate, usually inside the cabinet on a side wall. Measure the door and note the gasket profile. Order through the manufacturer or an authorized parts supplier using the model and serial number. Also note how it attaches: push-in (a dart that presses into a channel), screw-in (held by a retainer strip), or magnetic snap-in.
Tools You Need
The new gasket, a screwdriver or nut driver for screw-in types, a soft cloth, mild detergent, and a hair dryer. Wear gloves if the frame has sharp edges.
Remove the Old Gasket
Empty the door shelves if the door is heavy. For push-in gaskets, start at a corner and pull the gasket straight out of its channel. For screw-in types, loosen but do not fully remove the retainer screws, then slide the gasket out from under the retainer. Work one side at a time on screw-in doors so the inner panel stays aligned. Clean the channel before installing the new one.
Warm the New Gasket
New gaskets often arrive folded and creased. Lay it flat in a warm room for a while, or warm it gently with a hair dryer on low heat so it becomes flexible. Do not overheat it.
Install the New Gasket
Start at a top corner. For push-in types, press the dart into the channel with your thumbs, working around the door. Make sure corners are fully seated. For screw-in types, slide the gasket lip under the retainer and tighten screws evenly, a little at a time, so the door does not twist.
Test the Seal
Close the door and check it all the way around with the paper test. If there is a gap, warm that section with a hair dryer and hold it closed for a minute. Check that the door closes on its own and the cabinet is level. If the door itself is sagging, adjust or replace the hinges.
When It Is Not the Gasket
If the new gasket seals but the unit still runs warm, the problem is elsewhere, such as a dirty condenser, blocked airflow or a mechanical issue. Refrigerant and electrical repairs must be done by a licensed technician.
Hinges and Doors for Coldline Back Bar Coolers
If a door is bent or a hinge is broken, a gasket alone will not fix it. For Coldline back bar coolers, we carry replacement doors and hinges in Coldline parts, including the Coldline CBB-HINGBL bottom left hinge, the Coldline CBB-HINGTL top left hinge and the Coldline CBB-48-LG left hinged glass door. Match the part to your model before ordering.
Next Steps
If your unit needs more than a gasket, compare replacements in our reach-in refrigerators and bar refrigeration categories.
Questions? Contact Express KitchQuip and we will help you pick the right size and configuration.