Skip the auto shop - Our mechanics make house calls

Q: Hot at idle and low when driving never stays in middle

asked by on

Just replaced 3 freeze plugs and thermostat and radiator cap. Car won't hold stedy temp I have no leaks now and no heat maybe 2 min of heat then cool air.

My car has 167000 miles.
My car has an automatic transmission.

A: Hi. This sounds like the water pump is not ...

Hi. This sounds like the water pump is not circulating the antifreeze in the engine. When a water pump stops circulating the antifreeze as well as it should the car tends to run hot when it is at idle and cooler when you are moving because you increase the engine speed while moving causing the water pump to increase its speed. Another possibility is that the radiator is clogged and causing the flow of coolant to be restricted. I suggest you having a certified technician from YourMechanic come and diagnose your cars overheating condition to avoid any necessary repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car hissing and overheating

This could be an indication of either a cooling system issue, or possibly a head gasket. Never check the cooling system on a hot engine, or when the system is pressurized, or serious injury may result. The cooling system will...

Q: Car won't start spraid starter fluid in intake car turnd on but then shut of on self

Due to your symptoms, I would recommend having the fuel pressure tested by a qualified mechanic. The fuel pressure specification is set by the manufacturer and if the fuel pressure of your vehicle is lower than what was specified, the...

Q: I need a thermostat replacement, will they automatically do the coolant flush?

The cooling system is recommended to be flushed out anytime the thermostat is replaced if the coolant has not been changed or flushed recently. A thermostat does not always require the coolant to be flushed out and would be an...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.