How to Fix Defrost in Car: A Step-by-Step Guide

Here's how to fix a front windshield defroster: With the engine off and cold, check the coolant level. If the coolant is low, fill it up. ... Check the heating, ventilation, and air conditioning (HVAC) controls. ... Check if you can hear the blower motor running. ... Check for power at the blower motor.

As winter approaches, it’s important to make sure your car’s defrost is working properly. One common issue that car owners face is a faulty defrost grid. The defrost grid is responsible for melting snow and ice on your windshield, ensuring that you have a clear view while driving. In this post, we’ll walk you through how to diagnose and repair your defrost grid, so that you can keep your windshield clear all winter long.

Firstly, it’s important to understand that the operation of the defrost grid is power coming in and then a ground on the opposite side. The power goes through the grid, heats up each one of these wires, and then melts the snow or defrosts it. Once there’s a break in one of these wires, that whole grid line is going to stop working.

To diagnose where the break is in the grid, you’ll need a test light. Put the key in position 2 and turn the defroster on. Take the test light and round it off to a good ground, such as a door striker or anything metal that’s grounded to the body. Start testing each wire in the grid. If you come across a wire that’s not showing any voltage, that’s where the break is.

Once you’ve located the break, you’ll need to repair it. You can use a repair kit, which is comprised of a quick repair grit compound, a little brush to apply it, and a mask to keep it straight in the lines of the grid. Remove the mask, place it over the fault, and apply the compound with the brush. Apply the first coat of the repair compound, wait 20 minutes, and repeat the process until you’ve applied three coats. Let it dry overnight, remove the mask, and test your defrost grid again with the test light to check for any other faults.

In conclusion, fixing your defrost grid is an easy DIY project that can save you time and money. By using a simple test light and a repair kit, you can diagnose and fix the issue yourself. If you need quality replacement parts, be sure to check out They are your source for quality replacement parts and the best service on the internet.


Why is my defrost not working in my car?
If leaves or other debris are blocking the air intake it will affect the defroster. Vent Issues: If the vents on the dashboard are clogged, this will prevent the air from reaching the windshield. A quick vacuuming of the vents may fix the issue, if not the clog may be deeper in the system and require a professional.
How do I get my defrost to work?
Press the Defog/Defrost button. ... Turn off the Recirculation button if it's on.Press the Sync button (if equipped).Set the fan to the highest setting.If defrosting, set the temperature to High (automatic system) or Full Hot (manual system).If defogging, turn the A/C to On.More items...