Skip the auto shop - Our mechanics make house calls

Q: Heating/cooling system blowing cold/warm air when it should be warm/hot air

asked by on

System isn't blowing as hot as it should. So I blew out the heater core via from core hoses. Didn't help. So I replaced thermostat. Didn't help. What could be the issue, a bad heater core?

My car has 170000 miles.
My car has an automatic transmission.

A: This suggests you may have a clogged heater...

This suggests you may have a clogged heater core. As you know, the heater core circulates warm coolant through it that is used to blow the warm air into the cab via the blower motor. The other possibility may be that the thermostat is not allowing the engine to reach normal operating temperature. I would recommend having an expert from YourMechanic come to your location to diagnose your heating system.

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: daughter's 09 mini cooper clubman went to a corner store to get oil changed. Talked her into a anti freeze flush and now runs hot

I would start by checking the coolant level to be sure it was refilled with the proper amount of coolant. Next check all radiator hoses to be sure none are leaking. Also, check to be sure the coolant fans are...

Q: Starting problems - Cranks but don't start.

Hi there. The fuel pump is working, but the computer is fighting the resistance that the pump is putting out. I recommend replacing the fuel pump with the correct year of the vehicle to ensure that the resistance is the...

Q: Truck refuses to go into four-wheel drive

There is usually a certain procedure that is necessary for the switch to four wheel drive, such as selecting the neutral option on the transmission, or being stopped. If you have tried these and the vehicle still will not switch,...

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...
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...