Skip the auto shop - Our mechanics make house calls

Q: No heat after adding coolant and thermostat almost to H

asked by on

I had heat when I left for work. Coming home I had no heat. Saw coolant was almost empty. Added coolant, car thermostat was almost to H after I added the coolant. What could be the problem?

My car has 93365 miles.
My car has an automatic transmission.

A: Hello. If the coolant was that low then tha...

Hello. If the coolant was that low then that will cause the heater to not work. The most important thing at this time would be to determine where the coolant went. For it to be this low that means it is either leaking onto the ground or the engine is burning it. I usually start with a visual inspection to see if I can find the leak. If nothing comes up then I do a pressure test on the cooling system as that is more likely to show the leak. If nothing is still found I do a dye test and then a block test. This will tell me if there is something going on inside of the engine that may be more serious. If you need to have this cooling system problem looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this cooling system problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Get a quote

What others are asking

Q: Truck is overheating and heater won't work

Hello. The symptoms you describe are commonly associated with air bubbles in the cooling system. If the cooling system was recently serviced then it may be possible that it needs to be properly bled of air bubbles. Air trapped in...

Q: Rain water coming into car

The most common cause of water leakages into the vehicle are openings in windshield seals and window seals. These are common things to have replaced as the deteriorate due to the sun and age. A qualified technician, like one from...

Q: Misfiring and p0300 code

It may be possible the misfire is from coolant leaking onto the plug wires. You will need to fix the coolant leaks first and at the same time make sure the camshaft and crankshaft position sensors did not get coolant...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...