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Can a vacuum leak affect the AC?
If your air conditioning system is automatic, that can be the source of a problem. However, manual systems run off of vacuum, and if you have a vacuum leak then your system will not operate correctly.
Why does the AC in my car work but not the heater?
There are several things that can cause electrical problems for your car’s air conditioning. These can include failed switches, a blown fuse, a problem with the control module or something else. Fuses can short out and make the A/C stop working or a loose connection can create an electrical short that is easily fixed.
Can you pull a vacuum with a leak?
Never use a vacuum to test for leaks. You will not be able to find a leak under vacuum, and you will contaminate the system with moisture and noncondensible gases. Never pull a vacuum through a Schrader valve. This practice will only increase your evacuation time due to the high restriction it will cause.
What to do if your car heater is stuck?
If it’s stuck open, the the engine is going to take longer to warm up because coolant will circulate all the time. You can remove the thermostat and test it in a pan of almost boiling water, it should open just before it reaches the boiling point, then close as the water cools. If doesn’t move, then replace it!
What to do when your air conditioner is not working?
When you hear the blower motor running and have weak or misdirected airflow checking the vacuum source is a good first step. Vacuum diagrams of air-conditioning system can be found in online car repair manuals. The electric motor system first started to appear in the mid-90s on GM cars and trucks.
How can I heat my car without replacing the cap?
To do this, set the heater controls in the car to maximum heat, remove the radiator cap (or remote mounted coolant pressure cap, sometimes on the overflow tank) and fill to the correct level. Now start the engine without replacing the cap and idle for a few minutes.
Why is my car AC not working properly?
Car AC airflow problems on vacuum operated systems usually stem from missing vacuum inputs. No vacuum signal can cause the air to dump behind the dash and flow very weak from all of the vents. When you hear the blower motor running and have weak or misdirected airflow checking the vacuum source is a good first step.