High Blower Relay Replacement at your home or office.

Our certified mechanics come to you · Backed by our 12-month, 12,000-mile warranty · Get a fair and transparent estimate upfront

High Blower Relay Replacement Service

What is the High Blower Relay all about?

In vehicles that have manual heating, air conditioning and ventilation system, the blower motor serves to control the vehicle temperature through fan speed and air circulation. It does this by providing resistance to the blower motor circuit through a blower motor resistor when it is running at a low speed. The blower motor resistor works for all speeds except high speed, which is controlled by a relay on a separate circuit. The blower motor receives direct 12-volt power through the starter circuit when high speed is selected. If the high blower relay fails, the blower motor will not circulate air at all when high speed is selected while the remaining speeds still operate.

Keep in mind:

  • Blower relays often fail when the fan is working on high, but not on low.
  • A corroded blower resistor can cause the blower motor to fail.
  • No fan at any speed is a definite indicator of a bad high blower relay.

Our recommendation:

If you’re having problems with high fan speed on your car heating or air conditioning, then the problem could very well rest with the high blower relay. Our expert mechanics can check the voltage and determine if the relay is the problem, or perform other diagnostics to identify other issues that could be causing trouble with your car’s HVAC system. If it is deemed faulty, the high blower relay should be replaced.

What common symptoms indicate you may need to replace the High Blower Relay?

  • Car heater does not work
  • Air conditioning does not work
  • Fan speed operates on all speeds except full high

How important is this service?

This may not be a big problem in the summer, when you can always roll your windows down if you want to stay cool. But in the winter, you need high speeds for your car heater to keep you warm and defog your windows. It isn’t critical to have this fixed, but if winter is approaching, it might be a good idea to have it taken care of quickly.

Fast and easy High Blower Relay Replacement service at your home or office.

Recent articles & questions

How Long Does a Transmission Filter Last?
Your Your transmission filter is a very important component in your vehicle, because it’s the front line of defense when it comes to keeping contaminants out of your transmission fluid. Most automobile manufacturers recommend a transmission filter change every 2...
How to Transfer a Car Title in Nebraska
The The title to a car shows who owns it. When that ownership changes, the title must be transferred to reflect this. Title transfers are needed whenever buying or selling a car, as well as when a car is being...
How to Troubleshoot a Car That Has Extra Bounce or Sway
Bounce or sway while driving a car can be caused by faulty struts, shocks, or worn out tires. Check and inflate car tires to begin the diagnosis.

Do I need new gaskets when replacing the Y-pipe back?

Hi. Yes you should put in new gaskets for your exhaust system. If you do not replace the gaskets there is the potential that the old gasket will leak and cause exhaust noise. When replacing anything that has a gasket...

Cant I put manual hubs on my trooper?

Hi there. You can change the auto locking hubs to manual locking hubs as long as the parts will fit. Just keep in mind, by replacing the auto hubs with manual hubs, you will have to get out of the...

Engine light and battery light is on.

Hi there. Check the alternator and see if its not charging properly. Charge up the battery and start the engine. Check for a voltage on the battery with the engine running and see if its between 13.5 and 14.7 volts....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com