Skip the auto shop - Our mechanics make house calls

Q: Vehicle at running temp, turn on heat, no heat - stomp on gas, there is heat - ??? 2004 Jeep Liberty

asked by on

When I turn my Jeep on and let it get to normal running temperature I turn on the heat it blows cold air I stomp on the gas there's Heat let off the gas it goes back to cold air what could be the problem

My car has 104000 miles.
My car has an automatic transmission.

A: Hello - regarding your lack of heater funct...

Hello - regarding your lack of heater function unless the engine is revved up a bit, you have a coolant flow issue. This could be caused by a worn water pump (engine might be running warmer than normal?), a partially blocked heater control valve (adjustment problem or failed heater control switch), or clogged cooling system that simply has poor flow. I would recommend an inspection of the heater & cooling system by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for 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: How do I Unlock my engine?

Hi there. The PCV (Positive Crankcase Ventilation) Valve maybe plugged up causing the engine to not release any pressure in the engine. So the engine may have built up too much pressure to blow off the oil fill cover. If...

Q: While driving defroster set to hot blows hot air as it should, while idling it is blowing cold air.

First, the coolant level should be checked to make sure the radiator is full. While the overflow tank may be full, the radiator cap must be taken off to check the level inside the radiator. If you find the level...

Q: The car keeps running hot.

Hi, thank for writing in. I would recommend checking to see if you may have a blown head gasket. If you notice any signs of oil in the coolant or water in the oil turning a milky color, this may...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.