Is it normal for a car to idle high when cold?
High RPMs in the cold is a result of combustion taking place in the engine. Your car is able to start because gasoline and air are coming together to form a spark. Gasoline vaporizes much more easily in warmer temperatures to get that spark. In colder temperatures, fuel is more likely to get bogged down and thicken.
Can a bad coolant temperature sensor cause high idle?
A coolant sensor that always reads hot may cause cold driveability problems such as stalling, hesitation and rough idle. This also affects engine performance and fuel economy. If the computerized engine control system is faulty, high idling can be one symptom.
Why does my car idle at high idle?
If this tube becomes loose or broken it can leak un-metered air into the engine effectively causing an unbalance (via the mass air flow MAF sensor) in the computer system which can produce fast or slow idle.
What do you need to know about a car cooling fan?
The manual explains the operation of the cooling system, how your cooling fan operates, and the sensors or switches your car computer reads from to operate the cooling fan. Besides, the manual can help you locate sensors, relays, switches and trace circuit wires as necessary. Haynes makes good aftermarket manuals.
Why does my car AC fan make noise?
Is your car AC fan making noise, especially when it’s turned all the way up? This noisy AC fan is likely an issue with your blower motor. In this video, our mechanic shows you what to do if your car AC or heater makes so much noise that it sounds like an airplane that’s ready to take off.
Why is my car AC blowing warm at idle?
If you recharge your AC system regularly without actually fixing the leak, the air in the AC system can react with the oil and refrigerant, causing sludge buildup that settles in the condenser and evaporator.