Q: Car overheating and heat wont work

asked by on December 13, 2016

Car overheating and heat wont work

My car has 111000 miles.
My car has an automatic transmission.

Heater is not working Inspection $79.99 - $89.99 Get a Quote
Thermostat Replacement $141.88 - $639.09 Get a Quote

The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. When the cooling system is not properly circulating coolant through the motor, this results in the warm coolant not being pumped through the heater core properly in order to warm the inside of the vehicle.

Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. As mentioned above, this also restricts the warm coolant from flowing through the heater core which uses this to blow warm air into the cab of the vehicle. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.

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

Inertia switch/Fuel pump

The inertia switch is supposed to totally disable the fuel pump power supply when the vehicle is in an accident or rolls over. You will need to check the power connector into and out of the inertia switch to make...

2003 Nissan Frontier manual - engaging reverse stalls engine

Hello - this problem sounds as though your shift linkage is engaging BOTH reverse and a forward gear at the same time - effectively locking up the transmission. This would explain why the engine stalls when this occurs, but works...

What are the toque specs for a inner tie rod for a 2003 Ford ranger 2wd?

Hello. The torque specification for the inner tie rod on this vehicle is 74 foot pounds. Make sure that you properly lock the tie rod down also.

I' trying to start my vehicle and it made a loud clacking noise and the battery is drained

Hello. If the vehicle produced a clicking clacking sound when the key was turned then it may be possible that the battery or starter are the issue. A faulty, or low battery will cause the starter to click if it...

Cranks but won't start

Hello there, thank you for asking about your 2004 Chevrolet Impala. Your car has a leak which has to be pinpointed and repaired. If by chance the leak is in the head gasket, the head gasket will have to be...

What could be cause my car not to move when I put it in gear?

I think your transmission has failed internally. You may need to have it towed to a transmission mechanic for a transmission replacement or rebuild. If you would like to have one of our technicians give you a second opinion in...

can a heater core prevent, air conditioning, from blowing cold?

The heater core will not cause the A/C to not blow cold. If your A/C is working properly with the correct amount of refrigerant, then you may have a temperature blend door not working and staying on heat mode. If...

Car begins to shake at or about 50 mph. It's almost like a motor mount maybe broken. Could that be the issue?

Hello there, many faults will cause a vibration above 50MPH in your 2009 Chevrolet Malibu. It is great you have noticed the vibration is not in the steering wheel, as this rules out potential issues. The vibration is not likely...

The car makes noises while making a turn to the left

Depends on where the noise is coming from on your Mercedes C320. If it is from the front end, then it is likely a worn suspension component such as a sway bar link or a steering component like a tie...

Related articles

The Best Used Cars to Buy If You're a Carpenter
If If you're a carpenter, and working for someone else, the best used car is whatever you like that gets you to work on time and holds your tools – in short, practically any used car will do. If you...
Chevrolet Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are in the market for a used Chevrolet vehicle may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
The Best Used Cars to Buy If You Love Road Trips
If If you love to travel, comfort is very important in a vehicle. You want a nice, quiet ride, comfortable seating, and enough room. We have evaluated several used vehicles, and narrowed our favorite road trip vehicles down to the...