Q: Engine overheats, heater blows out cold air, coolant boils in radiator

asked by on

My engine overheats and the coolant boils and the heater in my truck blows straight cold air. I at one point drained my coolant completely with the plug on the bottom of the radiator and seen that it was dirty. I'm wondering what it could be? Do a thermostat replacement? Do a radiator complete flush? Or do both thermostat replacement and complete radiator flush?

My car has 177438 miles.
My car has an automatic transmission.

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. Engine overheats, heater blows out cold air, coolant boils in radiator

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: There is no heat blowing out of the inside vents.

No heat from the vents can be caused by a few different things. A few things I would check are the thermostat and heater control valve, as these are two components that control flow to the heater. If the thermostat...

Q: Heats up in the summer

Check for underinflated tires, dragging brakes, and transmission faults. The most common causes of overheating include low coolant level, a faulty thermostat (OEM, dealer supplied thermostats reduce diagnostic headaches), a plugged radiator (only flow testing can determine if the radiator...

Q: I changed the ignition and the key turns

Hello, thanks for writing in. If the ignition was installed correctly then you may have an issue within the fuse box. I have changed of number of these because of internal shorts. I will usually test the new ignition switch...

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 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.
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.