Q: Top water hose gets hot with new thermostat

asked by on

Top water hose gets hot with new thermostat and only one side of the radiator is hot
My car has an automatic transmission.

Hello. This is completely normal operation of the vehicle’s cooling system. The top radiator hose should always be warmer than the bottom. As coolant flows through the water pockets in the engine it picks up heat, and it is then transferred back into the radiator through the top hose. The coolant is cooled off in the radiator and then is recycled back into the engine through the lower radiator hose. Hence, hot on top, cold on bottom. If your symptoms were opposite, you would have more serious issues. The thermostat’s job is to hold the coolant in place until the engine is warm enough to need allow the flow of coolant through the system. Once the engine is warm enough to warrant coolant flow, the thermostat opens to a degree corresponding to the engine temperature.

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. Top water hose gets hot with new thermostat

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: Hi I have a 2010 Dodge avenger it starts up fine but the gear shifter seems to be disconnected from the gears it moves freely

I would recommend having your vehicle shifter and the vehicles transmission inspected by a qualified professional for damages. It is abnormal for the shifter to move freely and appear to not select any gear. It is very possible that something...

Q: not shifting at running temp

This can be caused by quite a few different things, from a bad transmission, to a bad speed sensor. Your Durango will need to be connected to a scanner so that all the relevant data can be observed. What is...

Q: Air conditioning and heater will turn on sometimes.

Check the wiring from the motor switch to the a/c and heating selection. Either the wiring is loose and is moving around causing the system to not operate properly or the switch has failed. If you need further assistance with...

Related articles

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.