No heat or hot air during idle is the result of air gap in the heater core. ... Use a funnel and fill both heater core hoses with 50/50 Dex-Cool (it does not take much, maybe 8 to 12 oz). Reconnect both hoses and reconnect both hose clamps. Fill overflow reservoir to proper level.
- What causes no heat at idle?
- When my car is idling the heater blows cold air?
- Why does the heat in my car only work when the car is moving?
- How do I fix the heat in my Chevy Impala?
- How do I know if my heater core is clogged?
- What are the symptoms of a bad thermostat?
- Why does my car stop blowing hot air when I stop?
- How do I get air out of my heater core?
- Why does my car take so long to heat up?
- How do I know if my heater control valve is bad?
What causes no heat at idle?
Two things come to mind, defective or wrong thermostat or low coolant level. The engine makes very little heat when idling, and if the thermostat does not close, the engine coolant temperature may drop low enough that you'll get no heat from the heater core. ... I have a car like that, lack of heat indicates coolant loss.
When my car is idling the heater blows cold air?
You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. ...
Why does the heat in my car only work when the car is moving?
When your vehicle is in motion and driving down the road, then engine coolant temperature tends to get hotter on the engine before it gets to the radiator, so the heater will naturally heat up more when driving around. Top off the coolant if its low. ... Click to see full answer.
How do I fix the heat in my Chevy Impala?
Just did it on a Chevy Impala 2007 but with antifreeze and solved the problem, exactly as VInce said above: "Fill reservoir all the way up, while the car is off remove coolant cap on the passenger side fill with water, once full squeeze top radiator hose at highest point, release squeeze release squeeze as water recess ...
How do I know if my heater core is clogged?
There are several telltale signs that you're experiencing a heater core problem:
- You have little or no heat inside your car. ...
- You smell coolant inside your vehicle. ...
- Your windows fog up. ...
- You see signs of a coolant leak under the dashboard. ...
- Your coolant level is dropping, or your engine is running hot.
What are the symptoms of a bad thermostat?
Symptoms of a Bad or Failing Thermostat
- Temperature gauge reading very high and engine overheating. The first and potentially most alarming symptom will be the temperature gauge reading high into the red within the first 15 minutes of your vehicle engine running. ...
- Temperature changing erratically. ...
- Coolant leaks around the thermostat housing or under the vehicle.
Why does my car stop blowing hot air when I stop?
A heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn't allowing the engine to properly warm up. A blower fan that isn't working properly.
How do I get air out of my heater core?
Start the engine of your car and allow it to warm up for a while. Once it reaches the operating temperature, the heater valve automatically allows the coolant to flow through the heater core. This action pushes the air bubble outside. Leave the car idle in this state for 15-30 minutes.
Why does my car take so long to heat up?
Your heater core can fail, and signs that it's doing so include no heat, excessive window fog, coolant leaks under the dashboard, low coolant, your vehicle overheats, and you smell coolant inside the vehicle cabin. If your heater won't heat up, your heater core may be the culprit.
How do I know if my heater control valve is bad?
Here are some of the warning signs of a bad heater control valve:
- No heat comes out.
- Heat is always on and you can't turn it down.
- Heater operates erratically, putting out more or less heat without any control changes.
- Coolant leaks.
- Low coolant level.
- Higher-than-normal temperature gauge readings (from loss of coolant)