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13

My first concern is that you have an exhaust leak. The exhaust is designed to exit at the rear and or side of the car, far away from your fresh air intake of the ventilation system in the cowl area. I would check for an exhaust leak starting at the front as you stated that it's coming in from through the ventilation system. This can be dangerous and should ...


12

The first thing I would check is the blower motor resistor. This device will usually be located near the blower motor under the dash, and will have an electrical connector with 4 to 5 wires coming out of it. It's job is to add more resistance to current flow with each lower speed. It really just 3 resisters wired in series all inside one component. High ...


12

I can't give you numbers or calculations without some work, but I can tell you than energy is never free. Cars have an A/C compressor that is mechanically driven by the engine because this is the easiest way to get the job done in a typical consumer car. An A/C compressor actually takes a huge amount of energy to operate. In fact a central A/C unit for a ...


10

There is no real point in doing a resistance measurement. BWM, like with most other stuff, decided to put more in there than you need. They have put active elements in there, that control the current through the motor based on a control input signal, this is nothing to do with a bad resistor, but with some failure in the transistor-drive somewhere inside ...


9

Well, Teslas (and presumably other all-electric cars) have A/C so it's not impossible, but A/C takes a fair amount of power. On the other hand, Teslas store a lot of energy. The A/C is something like 2.4kW which is about 8,000 BTU/h or about 3HP. So using an electric motor on a conventional car might give you a few more HP briefly, but the alternator has ...


8

The short answer to your question is no. As @JPhi1618 noted, the compressor is mechanically driven. Without the compressor you don't have any cooling. The AC runs by changing the state and pressure of a liquid, and compressing the liquid is a big part of that cycle. If you bolted an electric compressor onto the car you would have to find a way to switch ...


7

For an A/C system to be functioning correctly, you need: In the cabin: something to exchange cold (an evaporator) something to move air over the evaporator (the fan) a working blend door that allows the user to select heat or cold In the engine compartment: something to exchange heat (a radiator) something to move air over the radiator (radiator fan) ...


6

The single most common reason is something, often leaves or the like, finding their way into the fan. Regardless, you really need to remove the fan to fix the problem. If you don't know where it is then it's time to get that workshop manual you should already have to do regular maintenance and repair on the vehicle. once the fan has been removed rig up some ...


6

The blend air doors on the Windstar are vacuum controlled. The default position is defrost (windshield vents), meaning that if you loose vacuum supply it changes to defrost position. Look for a vacuum hose going through the firewall and trace it to where it hooks up to the intake manifold. It goes through a one way check valve and it teed into a vacuum ...


6

The reason for the odor is that water condenses inside the ducts when the AC cools the air. Though there are drains, there will still be enough moisture in the system to allow mold to grow. The heating is usually placed after the AC. This is useful for screen defogging: The air is first dehumidified by the AC and then heated, which gives warm, extremely dry ...


6

Yes, this is possible. Several companies (VAG, BMW) have switched to AC units that are driven by electric motors. For BMW, this is part of their Efficient Dynamics strategy, where they'll switch the compressor on/off depending on engine load to optimize fuel consumption. When the weather's not too hot, you can run the compressor intermittently without the ...


5

Here's an image to a cooling system for your reference. Each vehicle has it's own unique setup. The differences in some cases are slight and in some very big. You can see the placement of your heater core. Here's another image of a general layout for an AC system. A Haynes service manual is about $20. They are worth their weight in gold if ...


5

One way I could explain it from that photo, is that there will not have been any snow under the car, so the exhaust fumes will have easily been able to exit from the tail pipe and spread under the car. The fumes will then have gone into the engine compartment and from there could have been sucked in by the fan. Alternatively the exhaust could have had a ...


4

If it were mine and I could get by with one to two charges a season (3 - 4 months) I wouldn't do anything but that, and I can fix it myself. Once it gets worse than that I would fix it. Get another shop to check it out, play dumb as if you don't already know. Because evaporator leaks can sometimes be tricky to diagnosis. Once more than one shop agrees it's ...


4

I assume you've checked/changed the fuse first? If the blower motor is easy to get at, I would go and pulling the connector off and check that you're actually getting power to the motor and only then pull the motor if you've confirmed that you do. It wouldn't be the first time that it's actually the fan switch or something upstream from the blower motor ...


4

Update: The problem was indeed a leaky exhaust system! Alarmingly, the service shop I had tasked with the repair did not find this leak, but another authorized dealer found and fixed it. I'm horrified that a repair shop can manage to not find a fault like this, but glad to note that I'm not stupid: there really was a problem. Since then, I've sold the car ...


4

Possible Causes: Coolant Level Thermostat stuck open Heater Control Valve Temperature blend door Plugged heater core Coolant Level Coolant level that's even a little low can affect heater performance. It's near the top of the system so there could be enough coolant to prevent the engine from overheating but not enough to make it through the heater core. ...


4

bad air duct door You have multiple air duct doors in your car. One of them will control the air from your heater. You may have situation where the servo motor is bad in a particular door. Sometimes you can have a situation where hot air comes out of one vent and cold air comes from another and various combinations of the issue that maps back to a bad ...


3

I did a bit more research and it looks like this link sorts my issue: http://www.blower-motor-resistor.co.uk/vauxhall-vectra-c-blower-motor-resistor.html


3

The only real problem I see is damage to the compressor. The system has oil in it that keeps the part lubricated, and leaks sometimes allow for oil to escape. If you are recharging, and not planing on repairing, ask where the oil level indicator is. Ensuring that the system has oil is the key, because as the freon escapes air replaces it, so you are always ...


3

With the a/c off, the air coming into the cabin should be at outside temperatures unless something under the bonnet is heating it up. If your engine is running at correct speeds I'd be tempted to look at the airflow path and see if a hose is running along a radiator or resting on one of the hotter bits of the engine. Or is your cabin heater switch broken? ...


3

It's fairly common for the fan switch to go bad. You might be able to connect 12v directly to the fan motor and see if it runs, if there are only two wires going to the fan. But there are more than two wires and you hook 12v to the wrong ones, you could do some damage to an otherwise good fan.


3

You say the radiator fans work but those conditions sure sound like you aren't getting airflow when stopped. I say this based on your symptoms: Cooling goes down to zero when the car is stationary, starts to cool after the car has been moving for some time When stationary you are relying on the fan(s) to move air through the condensor to keep the system ...


3

The refrigerant in your Grand Cherokee is R-134a. It won't damage the ozone layer like the old R-12 would, but it's a potent greenhouse gas. See: http://www.roadandtrack.com/column/a-c-the-ec-and-global-warming I'm not aware of any part of the car that will be harmed mechanically by ignoring the leak and simply recharging the A/C intermittently.


3

Yes, the option exists in some models. E.g. in my 2002 Opel Astra, I can enable/disable any of the air channels on climate control independently from others: Usually, there's one ventilation duct going upwards and one going downwards, like here on Suzuki Vitara ('00-'06 model): The flap that controls whether the air from upper duct leads to defrost or ...


3

Your Sonata has a cabin air filter (CAF). You should try to change that out first. More than likely, you have some mildew built up somewhere. The CAF is the first place to start.


3

@Paulster2 is spot on. The AC clutch has to be engaged in order to set the correct baseline for high-side/low-side refigerant pressure. I will add one point here that is often overlooked. The ideal thing to do is find out the mass of refrigerant that is required to fully charge the system, because that is really what the whole system is designed for. Here ...


3

As far as I understand it, your pollen filter is filthy and should be cleaned or replaced.


3

Air in an A/C system is a significant contaminate. It raises pressures and decreases cooling efficiency. System refill steps: Pull vacuum on the system to 29mm/hg for at least 1/2 hour. This low pressure and time has two purposes. Removes almost all the air. boils out any water that may be in the system. As a leak check; seal the system with a gauge ...


3

Bad AC odors are usually related to poor drainage of condensation, which allows mold to grow. There is a small drain hose which allows the condensation to drip out, but this can get clogged up or blocked by dirt. If this is the cause, then simply cleaning out the drain may be enough to clear things up. A quick google for your car model and air ...



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