Q: Heater

asked by on

i have a heater problem in my 97' dodge ram 1500 , replace thermostats and flushed heater core, even replace radiator and climate control switch, all it is blowing is cold air. not sure what to do next?

My car has 185000 miles.
My car has an automatic transmission.

Hi There, You may have a clogged heater core that may be prohibiting the outer linings of the heater core to get hot. As you know, the heater core is a series of tubes that the coolant runs through that generates the heat from the warm coolant after circulating through the motor. These tubes can occasionally develop a buildup on the inner walls such that when the heater core is "flushed" this buildup on the inner walls of the lines remains and still allows the coolant to flow through the heater core. It is important to note that when the heater core is "flushed" it is possible to get good flow through the heater core while the inside walls of the heater core remain caked with buildup. As a result, the buildup on the inner walls prevents the temperature from rising to its capability due to the insulating effect of this buildup on the inner walls which will prevent the necessary heat transfer to properly heat the inside of the car. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your heater core.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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

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: My battery light comes on when braking and every once in a while while driving?

Hi there. Sounds like a battery terminal is loose and becomes slightly disconnected when the car is shifted forward during braking. Check the battery cables and make sure that they are tight on the battery terminals. If the battery cables...

Q: My truck is running hot ns the water is bubbling over!!

Hello. Thank you for writing in. The vehicle can overheat for many reasons. One of which may be the thermostat. The cooling system relies on the circulation of coolant for heat transfer to occur correctly. If the thermostat is not...

Q: Timing issue on a 1996 ram 1500 5.2

If the valve timing was off at speed, inasmuch as the 5.2L is an interference engine, you want to first rule out mechanical damage. A way to do that is perform a compression test on all cylinders. If compression is...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...