Q: My upper radiator hose is hot and my lower radiator hose is cold ..my car is also overheating and my radiator fan is not on

asked by on

My car is overheating my upper radiator hose is hot but my lower is cold and my radiator fan is not kicking on.. Help

My car has 225000 miles.
My car has an automatic transmission.

It sounds like you may have a faulty coolant fan relay. The coolant fan relay helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this relay is not working properly, this can cause the fans to come on intermittently, stay on 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. The other possibility may be that the radiator may have some blockage as the upper hose is hot and the lower hose is cold, indicating that the coolant may not be ciculating properly. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My upper radiator hose is hot and my lower radiator hose is cold ..my car is also overheating and my radiator fan is not on

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: How quickly should I take my car to the shop? It says service ecm. How much does this usually cost?

Hello, thank you for writing in. While there is typically not a designated warning light for the ECM (electronic control module), there may be a check engine light pertaining to it. If you pulled a code for the ECM, further...

Q: gas mileage difference 383 stroker motor 400 hp or ls3 computeried 400 hp same car

The gas mileage attained in either of these applications will depend heavily on your driving habits as you may already know. Either of these will also depend heavily on the type of intake system you are using to arrive at...

Q: Door open/ajar sensor will not turn off .

You may have a worn door latch. With someone in the driver's seat watching the light, close the driver's side door, and push in on the door evenly with the latch to see if the light goes out. If it...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
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...