Skip the auto shop - Our mechanics make house calls

Q: I have an overheating problem. Its not the fans! With the radiator cap off I can't really see the fluid flowing until I hit the gas.

asked by on

I have replaced the clutch fan with electric fans . sometimes it doesn't get over the N. (NORMAL). I've started the car with the rad cap off and it didn't blow water out. So it's not the head gasket. I'm trying to figure out whether it's the water pump. The T stat... Or the Radiator. And I dont loose water until it seems like it's backing up and overfilling and flowing out of the over flow jug. Boiling water. That's when it over heats. Any ideas. Thanks I advance.

My car has 174000 miles.
My car has an automatic transmission.

A: Hi there - lets look at the behavior overal...

Hi there - lets look at the behavior overall. Did you replace the clutch fan with electric fans because of an overheating issue? If so, that fundamental issue is likely still present. If temp rises quickly to overheat (matter of a few minutes, even at idle), thermostat is stuck shut, or - there is an air pocket in the cooling system (if the system wasn’t bled properly after work where the coolant was drained) - that will cause fairly violent "boiling" inside the engine, and blow water/steam out of the overflow jug.

A blown headgasket can just "superheat" the coolant over 5-15 minutes without "blowing" water out under pressure if the leak is small enough. You can chemically test the coolant for the presence of combustion gases. If you make the fans run all the time does it still overheat? Does it only overheat very slowly over time? If so, it may just be a clogged radiator (inside or out).

I would recommend having your car’s overheating issue inspected by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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: Engine

Hello. Thank you for writing in. Do not assume right away that you have blown a head gasket. When the cooling system overheats and throws coolant all over the engine bay, every hot part of that engine will create steam....

Q: Car overheats after 25 minutes

Hello! A stuck closed thermostat will cause a vehicle to overheat in about that time. A coolant leak, bad fan operation, or a leaking head gasket will produce similar overheating conditions. I suggest having the coolant system inspected by a...

Q: Why wont the fan start? Smoking near fan, cooling fan new but wont start. engine overheats.

Hey there. As you alluded, this is a sign of a bad cooling fan relay switch. The cooling fan relay switch comes on when the temperature reaches a certain level to help cool down the radiator. When this is faulty,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...