open or missing thermostat
The rpm's are not at a high enough rate when the car is idleing to engage the clutch plate on the compressor. To get the car to blow cold in park simply give it some gas to raise the rpm's. Belinda from Texas
rev limiter will only let the RPM's get so high then it cuts back
you may not be at a high enough rpm
Furnaces have no RPM ratings
Adjust your idle.
Put the engine into high RPM in neutral or park.
Because bike engines Rev at high speeds typically 10k rpm as compared to 3 or 4 k rpm for a car
when u first start the car it will idle high, around 1.5 rpm to 2 rpm. when its warm up it should idle between 700-1000 rpm
Has to do with the rpms if it's idle not much power is giving out to the car from the fan belt to get very warm. Say next time you're in your car. Start the car give it a little gas where the rpm is almost at 2 rpms. Same goes for the a/c.
It is intentional, it is called high idle. It helps warm the engine to proper operating temperature.
o2 sensor
Yes for both and will be longer amount of time when cold.