Q: Heat inside car stays warm for minute then blows cold until I turn heat off for a minute and try again.

asked by on

Hello, I own a 2002 Mercury sable 3.0 OHV, 125,000 miles. I just found out the heat on my car hasn't been working and it's hard to pinpoint the exact time this started because it has been summer months and just recently I've needed to use my heat. The car will heat up to normal operating temperature on the gauge and nothing out of the ordinary and I'll turn the heat on and after waiting the normal couple minutes while driving I notice the heat isn't all too warm, so I'll turn off the heat and drive a little more and then turn it on and it'll be nice and warm and proper heat level for about a minute and then go back to blowing semi-cold air (not regular ac level cold but definitely not warm air. The actual engine temperature is always at normal operating temp and the heat intensity doesn't change depending the speed I travel. My coolant levels are topped off every oil change at my local shop and this occurs every 3,000 mi and I checked to be sure and the level was normal.

My car has 125000 miles.
My car has an automatic transmission.

Hi there. The engine always at operating temperature leads me to believe, the thermostat is not the cause, for no heat inside the vehicle. There are several possibilities for no heat inside, the heater control valve is malfunctioning, the heater core is restricted, the temperature blend door actuator is malfunctioning. Replacing components without diagnoses, can be expensive and time consuming without resolution. I recommend having your vehicle’s inoperative heater be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?
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. Heat inside car stays warm for minute then blows cold until I turn heat off for a minute and try again.

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: I own a 2000 mercury sable LS DOHC and yesterday I changed my cyclinder 3 coil and my car ran better then ever but I went to start

Hello. There are 2 likely sources of the white smoke - which is engine coolant getting into the exhaust system. The lower intake manifold gasket can leak coolant into the air intake and a blown headgasket - common on these...

Q: My breaks sometimes stop car completely and sometimes it doesn't what would cause this?

Usually a person describes such an experience as more force than usual is needed to stop the car. I am not exactly sure what you are experiencing here, so I will address a few things. Speed and weight of your...

Q: Car won't start after it ran out of gas and was filled again

Sometimes if a vehicle runs out of fuel it can get air in the fuel lines. Any time a vehicle runs out of fuel and more fuel is added, the key should be turned to the 'On' position then back...

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...
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...
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.