Common Chevy Heater Problems Explained

With winter settling in, you're likely to become heavily reliant on your heater. If it's not working, you have a few long, cold months ahead of you. We’re going to run through some of the most common problems and give you tips on how to fix them, so your commute will be a little warmer this winter.

Not Blowing on Certain Settings

If your heating works but the fans won't blow on certain settings (for example, it’ll work on 1 but not on 3), your blower motor resistor may be damaged. Fortunately, this is a simple DIY job. Depending on which model Chevy you have, such as a Blazer, there may be a rubber-like cover on top of the resistor that you will need to cut away with a box-cutter or Stanley Knife to access the part and then reseal it after you replace the blower motor resistor. There are quite a few videos online that can walk you through the replacement process. This one between the 1:00 and 5:00 shows how to change the part on a 2004 Malibu, but the process is the same for all models.

Fans Working But No Air Coming Out

This is another easy fix. If you can hear your fans working and can feel a temperature difference when you put your hand on one of the vents, it’s likely the cabin air filter is blocked. The easiest way to fix this problem is to replace the cabin air filter, typically a five minute job. The location of the cabin air filter will vary depending on which model Chevy you have, so look in your manual or for instructional videos online to find the exact replacement process.

Only Blowing Cold Air

This can be caused by two things:

  • Damaged thermostat
  • Blocked / air in the heater core

To check that the thermostat is working properly, you will need to drive the vehicle for a while to get everything up to temperature. If the temperature gauge isn't reading normally, you likely need to replace your thermostat. This video will walk you through changing the thermostat on a Chevy truck. 

If the thermostat is reading normally, you need to flush out the heater core to make sure there’s no blockage or air in the system. You can do this at home, but it's recommended you take your vehicle to an automotive repair shop or dealership to get this done. If you are comfortable with the DIY option, this video shows you the easiest way to flush out the system without having to use compressed air and should only take an hour or so if you haven't done it before.