Q: 2004 Trailblazer. The check engine, service 4wd, abs and parking lights all came on and my heater quit working.

asked by on December 29, 2017

I got into my truck yesterday angrier it worked fine all day and the dash lights for check engine, service 4wd, abs and parking brake all came on and the heater totally quit, no heat, no fan blowing. Truck ran to get me home but I kinda don't want to take it back out now.

My car has 80000 miles.
My car has an automatic transmission.

Electric Problems Inspection $79.99 - $89.99 Get a Quote

Hi Kenny. Thanks for sending your question to us today. When multiple electrical issues like you’ve described exist, there are two distinct possibilities. First, you either have an exposed wire that is creating a rather serious short, or you have several sensor, fuses or relays that are not working properly. The first thing I’d do is check the fuse and relay that powers your heater. If it’s not damaged, then you likely have a pretty serious electrical gremlin that would require an electrical inspection to isolate.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

When I take off or reverse the back of my truck makes a cracking noise

You should inspect the rear driveshaft U-joints to see if the joints are bad. You may see where the joints are loose or rust around joints. You will need to replace the U-joints if they are loose or making noise....

Car trying to start but won't turn over

Be sure you have a fully charged battery that passes a load test. With a fully charged battery, if the starter motor does not run that signifies an electrical problem in the starter circuit or a problem with the starter...

EVAP system Pending catalytic code with CEL

It is possible that you could be experiencing a catalytic converter failure. This can be due to the fact that after driving 30-50 miles the exhaust system heats up quite a bit. Once the exhaust is heated up the catalytic...

The computer for my car says it's EGR flow and there is no other symptoms. What you think?

Either the EGR (Exhaust Gas Recirculation) valve is stuck open or is closed and not opening. First try removing the EGR valve and cleaning it out. Then see if the engine light goes out and the engine runs good. If...

No acceleration when I press the gas

Hi there. Typically when you have acceleration problem as you are describing it can range from fuel, ignition or transmission problems. If the fuel system is clogged with excessive debris or carbon deposits, it will create acceleration problems, as will...

I have a Chevy Malibu 2013 with 75757iles on it jeering forward while idling and pushing on gas but not after I accelerate and eng

What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Buzzing noise when turn my fan to a certain setting and sometimes when start car

This may be a sign of a faulty blower motor. As you might know, these have electric motors in them that wear out over time and will begin to make squeaking or grinding noises as the bearings begin to wear...

Gas gauge & pumping gas

Hello, It sounds like you may have two separate issues going on here. Your car has a float type device inside he fuel tank which measures the level of the fuel and sends a signal to the computer which then...

My car sounds like it has a bad wheel bearing with a loud banging sound coming from the back area.

Hello and thank you for contacting YourMechanic. The noise could be a loose spare tire or something in the trunk bouncing around. If not, then there could be a lubrication failure in the differential or a loose axle mount. ...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Captiva Sport
The The 2012 Chevrolet Captiva Sport is a brand new vehicle and is an eco-conscious crossover SUV for the environmentally friend consumer. It comes standard with many features, but also has many available options so it can suit any buyer’s...
A Buyer’s Guide to the 2012 Chevrolet Tahoe
The The Chevy Tahoe has always been one of the most popular SUVs on the market, and this trend continued in 2012. As always, the vehicle proved to be reliable and powerful, with plenty of space and features that people...
2012 Toyota Tundra vs. 2012 Chevrolet Silverado: Which One Should I Buy?
Large work trucks are meant for one thing: work! These vehicles are rough and ready, and can handle nearly anything you throw at them, with the exception of a car pool. While they offer two or four door options, you...