Skip the auto shop - Our mechanics make house calls

Q: I have to fill my radiator and reserve tank almost every week.

asked by on

I had my radiator, timing belt, and water pump all replaced in 2016. I replaced the thermostat and spark plugs in 2016. I find that my car leaks coolant, and I have to fill my radiator on an almost weekly basis. Further, I have noticed that at times, my car hits 4,500 rpm's before shifting gears. I am at a loss as to what could be causing the leaks. Any input you might have is greatly appreciated.

My car has 150000 miles.
My car has an automatic transmission.

Hi there. If the leaks to the cooling system are visible on the ground, then there is an external leak on the cooling system. Check all of the hose clamps to the radiator and water pump. Also, look to see if any of the coolant hoses are damaged causing the leak. If you cannot see any visible leak, then check the engine oil and the transmission oil. If the engine oil has coolant in it, then the head gasket may be damaged causing the coolant to enter the oil galleries. If the transmission oil has coolant in it, then the new or the older radiator may have been leaking inside over to the transmission cooler tanks. I recommend seeking out a professional, such as one from Your Mechanic, to help you if you are unable to find the leaks.

For the transmission shifting at 4500 rpm’s, the output shaft speed sensor (also know as the vehicle speed sensor VSS) has a loss of power or is damaged. Check to see if the harness is hooked up to the VSS and see if there is any broken or frayed wires. If you need further assistance with your transmission shifting at a high rpm, then seek out a professional, such as one from Your Mechanic, to help you.

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


If you are sure that the dash gauge is correctly reporting the temperature, then the other causes of overheating should be considered. Other than than a clogged radiator and a stuck thermostat, these other common causes include a faulty radiator...

Q: What does it mean if the Malfunction Indicator Lamp comes on?

The Check Engine light is actually called a Malfunction Indicator Lamp. It’s designed to come on when there’s a problem with any component in your emissions system. That covers a wide range of sensors and other equipment on your engine,...

Q: Car won't start

If you are smelling fuel, then you may have a leak and should not try to start the vehicle until the source of the fuel leak is found. Your vehicle may have a leaking fuel line or injection system. Sometimes...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.