Skip the auto shop - Our mechanics make house calls

Q: Car still overheats after new thermostat & waterpump, heater blows cold

asked by on

Car ran hot. Local shop changed thermostat, waterpump, & rad cap. Heater blows cold. Bottom rad hose cool, top hose hot. Coolant in tank bubbles.runs smooth. No oil/water mix.

My car has 175000 miles.
My car has an automatic transmission.

Hi there. The first thing that comes to mind is the cooling system was not properly diagnosed and/or the cooling system was not properly bled, after repairs were performed. A cooling system flush could resolve the air trapped issue. I would think, the repair shop would be willing to take another look at your vehicle’s overheating issue at no charge, given the vehicle was returned to you supposedly fixed. The bubbles in the coolant could be the result of a head gasket concern, even though there is no oil/water mix. A combustion leakage test should be performed. I recommend having your vehicle’s overheating issue be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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
  • Home
  • Questions
  • Car still overheats after new thermostat & waterpump, heater blows cold

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: Fans on my radiator aren't working 2003 Honda Accord

Hi there - there are 2 components that drive cooling fan operation: temperature sensors on the radiator, and the air conditioning switch. Even if the engine temperature (measured at the radiator) isn't hot enough to switch the fans on, turning...

Q: Fuel pump will not kick on.

With fuel issues such as these, there are a few things to consider first. If the fuel pump and all of that has already been replaced, then it is likely the issue is not with the fuel pump itself. The...

Q: The car smells of gas, probably has a leak

When an air conditioning refrigerant leak is being detected, a mechanic will often use an electronic leak detector that is specifically designed to 'sniff' for a specific refrigerant. These electronic leak detectors are also made to detect fuel leaks. I...

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...
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...
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.