Q: Coolant system

asked by on

Broken belt for water pump, engine got close to the red before shut down. Then after repair and filling it with coolant, it still got hot even though the temperature gauge read normal. Upper radiator hose was swelled and dancing around. Replaced radiator, water pump, and thermostat. Looking in radiator with engine running i see no movement of coolant. I can squeeze upper and lower radiator hose and can't feel any coolant moving. Drove about 20 miles and it did not over heat but still don't see coolant moving.heater blows hot air and even with heater on I don't see any movement. I ran water from the garden hose through heater hoses, no blockage, removed upper radiator hose at the radiator and the bottom hose at the radiator and ran water through engine block, no blockage. So my question is should I be able to see coolant moving with the radiator cap removed? All parts are genuine Toyota parts. Also had a code of P0115.

My car has 220000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. The P0115 code is for a temperature sensor that is open or shorted. This could be a failed sensor, or just that the engine temperature has gotten to a point that is outside of normal parameters. There is some testing that can be done to verify its function. As far as the coolant circulation, once the thermostat opens, you should be able to observe the coolant circulating through the radiator. There could be an air bubble in the system that needs to be bled out, but I would really question if the water pump is working at this point. I would wonder why the belt broke in the first place. If the water pump failed, it could have broken the shaft that drives the impeller on the inside, and therefore won’t circulate the coolant. It could also have caused the belt to fail. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

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. Coolant system

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: Check Engine codes P0310 and P0705.

The p0301 code could be caused by a bad spark plug or coil pack on the engine. I would have a technician perform a tuneup and test the coil pack to see if this clears up the misfire. As far...

Q: The electric power steering system warning light is on and check engine light is on.Code P0607

P0607 is a code for a control module failure It may mean a control module failure or It may be set by low battery voltage or wiring harness problems. To have it show up on such a new car makes...

Q: Why does the heater blow hot air for a short time and then blow cold air?

It sounds like you may have a low coolant level. There may not be enough coolant to reach the heater core to provide you with hot air in the car. A visual check of the coolant level while the vehicle...

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.