I have the identical problem on a 1991 Jimmy. I have replaced the blower motor and flushed the heater coil. I know the vents are working properly because they work when the temperature is selected to cold. I am wondering if there is something under the hood that redirects the aif flow either through the cooling coil or the heater coil based on the position of the temperature control. If so possibly the heater coil (air side) is clogged. I noticed that the heater coil is below the AC coil so it is possible that debris is down in it. I may try to pull it and clean it. Have you tried that?
Did you happen to move it to Defrost when you turned it off? The ac compressor also runs in the defrost cycle to keep the seals lubricated during the winter months when the ac is not used.
when the defroster is turned on, it activates the a/c compressor. the clutch may be locking up on the compressor.
The A/C system compressor operates when in the defrost mode. If the noise is also heard when running the A?C it is more than likely a problem with the compressor/pulley.
you probably have a leaking heater core....you can replace it or bypass it
i just replaced the thermostat in 2004 Chevy truck heater works fine now
Yes. This increases its volume, which results in a decrease in its density.
It is not supposed to be on when engine is running unless there is a problem.
DO NOT FEAR THIS !!! The ac comes on with the defrost: because do you ever use your ac in the winter? me neither. Manufactures have made the ac come on with the defrost to prevent the ac compressor from seizing up. Since we never use them in winter, at least in cold climates. Cheers and drive on.
It only stays on when the air flow is turned to defrost. It does this because the air condition has a dryer on it that dries the air which defrosts the windshield better.
check ground wire on front of engine behind starter.
It's supposed to compensate idle for added load, most all cars do that when ac is on as well ECU adds about 50 rpm to prevent stalling.
The radiator cooling fans are turned on when the heater control is set to defrost.This makes for better and more effective defrosting of the windshield
You may have a broken pipe or have not paid your water bill and they turned it off at the main. Check the main for a tag from the department of water and power.
The best winter settings are defrost, external air flow and hot temp. In warmer, rainy weather, the best settings are is defrost, external air, comfortable temp, and A/C on. The A/C is necessary to dry the external air but is not needed in wintry conditions, becase the air already has very low moisture content (even when snowing). The biggest mistake that folks make is having internal air circulation turned on. In this setting, humidity from your breath builds up. Even heating this air will eventually become ineffective.
the form of energy changes and the total of energy increases
Because the bulb is burned out.
Heater core is leaking
check your oil level?
Sounds like you have the wrong switch turned off.
The trolls turn into stone. They were arguing and forgot that the sun was coming up soon.
If the fine focus knob is turned backwards the depth of the specimen decreases. When the knob is turned forward the depth of the specimen increases.
The number increases by 0.125 at each step.
A torque multiplier increases the torque by increasing the length from which a bolt or nut is turned. This process is referred to as "mechanical advantage."