Can AC or heater damage the car when they are on at startup

Does having an AC or heater on as soon as you start the car damaging?
Experienced mechanics share their insights in answering this question :
Not really. When I was a kid it did because the cars were really basic and didn’t have safety features. But today, all modern cars have relays for all this stuff. There is a heater relay and there is an air conditioning relay. So the heater relay prevents any damage from happening when you start the car and will prevent any extra voltage from going to the system and wrecking the heating system or the AC system. That said, it is usually better idea to have everything turned off when you start the car anyways. Because then, all the electrodes in your car are used to start the car and will generally help it start up smoother. But if you forget to turn the air conditioning off, it isn’t very damaging.

How to Identify and Fix Common car Problems ?

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Here`s the short answer: it`s fine to switch between heat and AC, even if you`re doing it frequently. As long as you`re doing it the right way, you`re not running up your energy bill or wearing out your equipment before its time. However, a lot of people don`t know how, or more importantly, when to make the switch.
Simply put, running the A/C and heater will dehumidify and remove moisture from the air. To explain further, the relative humidity is the percentage to the dew point for droplets to form. This point increases as temperatures rise.
If the AC is running harder than normal due to excessive heat conditions, it can damage the entire system. Temperatures may not be exactly what you set them at, so you can expect a slightly warmer room.
The heat will still work in a automobile when the compressor is not working. The engine coolant runs through a small radiator and the fan circulates air through it which provides the heat, the compressor is not involved in heating.
Is Running Heat & AC In One Day A Bad Idea? By itself, the act of switching from AC to heat poses no inherent danger to an HVAC system.
Despite what some say, it`s fine to switch between your air conditioning and heating systems.
Your car`s HVAC system is very similar in that the A/C and heater are mostly separate from one another. The A/C uses refrigerant, while the heater uses hot engine coolant. Select parts of the air management system tie both sides of the climate control together.
What is causing your heater to activate? Electrical issues within your central AC unit are the most likely causes of your heater turning on when it shouldn`t. Shorted wiring, faulty electronics in your furnace, or an electrical problem with your thermostat, for instance, could all explain the issue.
Overheating. An overheating AC unit may also trigger a fire. AC units tend to overheat if: The air filter or coils are dirty.
Heat will affect your air compressor in a whole range of ways, including: Lower Flow Rates – Higher temperature means air is less dense, so less air makes its way through the intake. Higher Cooling Water Temperature – The heat raises the temperature of your cooling water, forcing it to work harder.
Generally yes, as long as the outside temperature is above freezing and the more common settings are used. The compressor cycles on and off as its needed, the colder it is the less its needed. It serves to dry the air to keep the windows from fogging up.
Whether it`s your heater or air conditioner, don`t switch between systems until that one that`s currently running ends its present cycle. Once it stops running, set your thermostat to “off.” After that, give your HVAC system five minutes or more before switching from heat to AC, or vice versa.
Can we use AC to warm the room? Hot and cold air conditioners can regulate the temperature according to your liking, both in summers and winters. The air conditioner simply reverses its function, allowing the AC to run efficiently during winters, thus throwing warm air in the room.
You can use the a/c compressor while controlling the heat setting of the car to control the climate within. Doing so will help dehumidify the air, reducing fogged up windows. Running the air conditioner will also help clear up window condensation.
Your Coolant System May Be Airlocked

If your heat only works when driving, this can also be caused by air pockets. Air pockets within the cooling system can prevent adequate coolant circulation and are sometimes the result of low coolant or a faulty radiator cap.

Low coolant: Whether caused by a leak or water evaporation, low coolant is the most common source of poor heater output. Thermostat: A stuck-open thermostat prevents the engine (and coolant) from heating up. Heater core: A clogged heater core restricts coolant flow, giving up little or no heat.
A package HVAC unit combines multiple units, such as an air conditioner and heater, into a single unit. The unit is usually placed outside. Split systems, on the other hand, divide each system into its own unit, so your heater and air conditioner are separate.
Check to make sure that your furnace has an adequate supply of fuel and that a draft isn`t preventing it from burning its fuel. Try to turn off your furnace for several minutes, then turn it back on to see if the light re-ignites. If this does not work, it could mean that your furnace`s igniter is faulty.
Loss of refrigerant: This is the #1 way a compressor might die years before its time. The amount of refrigerant in an air conditioner is specially set to work with the compressor. If the AC loses refrigerant through leaks, the imbalance will eventually cause the compressor to overheat.
Unless systems are cleaned regularly, air conditioners can be a source of health issues. Air contamination can become a severe problem that contributes to respiratory ailments in people. Additionally, air conditioning at work and home can lead to problems, such as colds, fevers, headaches and fatigue.
Question: Does having your air conditioning on while you start a car engine shorten the battery life? Answer: In a word, no – as long as your car was made in the mid-1980s or later.
Failing to clean your AC regularly permits dust, dirt particles and pet hair to accumulate in the air vents, filters, coils and the outside unit`s fins. This debris obstructs the proper air flow and can lead to a system malfunction and fire.
load-shedding followed by restoration of power supply may result in such an accident, say experts. When summer is peaking, ACs can overheat due to excessive heat and cause fire which then causes the explosion of the pressurised gas.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Low coolant light comes on when AC, defrost or heater is on, but only if the car is in gear and stopped, what’s wrong with my car?
ANSWER : First, you want to make sure your cooling system is full. Check the radiator not the coolant jug. And check it when it is cold. If it needs coolant, add some. Of course, I don’t feel this problem is an actual low coolant condition. I would expect to find an electrical failure in the instrument cluster or from a component or wiring harness that is connected to the instrument cluster.

As a technician, I have access to reports from technicians across the country. I could not find any reports of this problem, so diagnosing this will require an experienced tech as this is not a common problem. In addition, this happens at intermittent times making it difficult to recreate. The most challenging part of this diagnosis will be recreating the symptom. I suspect it has something to do with the brake switch circuitry because it only seems to happen when you have your foot on the brake. I would begin my diagnosis there with a wiring diagram and test light in hand. The brake switch, instrument cluster, and environmental controls all interact with each other. Something is crossed either because of a failed module or damaged wiring in a harness.

Aside from making sure the coolant is full, this will not likely leave you on the side of the road. If you take it in to be diagnosed, be prepared for them to spend more time than usual to figure it out. Since it isn’t a key problem, you may need to live with it until it completely fails making it much easier to diagnose. Either way, I do recommend having a certified mechanic diagnose the warning light to make sure there isn’t anything serious going on.

Good luck.

When I turn on my AC the radiator fans do not turn on. The fans do come on when the car warms up so I know they are working and the fuses are good. The AC compressor does come on and the air blows ice cold when the car is moving. Car is a 2006 Chrysler Sebring Sedan 2.7l v6.
ANSWER : The control circuit for the fans needs to be checked. For example, there is usually a condenser fan relay in the A/C electrical controls. There could be a fault with that relay and/or wiring problems, perhaps even just a loose connection, blown or loose fuse, and so forth. To resolve something like this, the recommended service is an electrical component diagnostic. If you request that diagnostic service, the responding certified mechanic will get the problem pinpointed and resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

when I turn my ac on my cars idle drop and stalls out and the ac is hot
ANSWER : Hello, thank you for writing in. Although the pulley is still spinning, the compressor has likely failed. If it is not properly regulating pressure in the system, one of the first signs is a warm air conditioner. Considering yours is not cooling off, the pressures are not correct. If you believe the compressor is working correctly, you may want to check for a clogged line before replacing it. Keep in mind, a blocked line has likely put extra strain on the compressor, and may cause premature failure. For more help with testing or replacing the compressor, contact our service department to schedule an appointment.

Why is my car heater blowing cold air? I start my car, give it a few minutes and the heater never heats up.
ANSWER : The lack of heat being generated by your system may indicate a clogged heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. The other possibility is that the thermostat may not be allowing the engine to reach a normal operating temperature and since the engine’s warm coolant is the essential source of the heater core supplying heat to the inside of the vehicle, this can impact the warmth of the heat inside the vehicle. I would suggest having an expert from YourMechanic come to your location to diagnose your heating system.

My car has smoke damage inside somebody tried to steal it and try to burn the car how much does it cost to get a car cleaned out f
ANSWER : Hello, thank you for writing in. Your situation is incredibly unfortunate! Hopefully insurance will help pay for the damages. Pricing is going to vary greatly depending on your location. You are going to want to gather a couple of quotes and compare pricing. The damage done, and the kind of help you have in your area will all effect pricing. If the majority of the damage is inside of the cab, you are looking at having the interior redone. Seats, flooring, electrical components, door panels, window seals, and whatever else would have been damaged will be priced individually for the most part. If engine damage has been done, you will have to do a full diagnosis before obtaining a quote. For more help, or a quote from our technicians, contact our service department to schedule an appointment.

I have a mini r53 s (supercharged) runs fine but when car stop and AC is on for a wile car overheat
ANSWER : Your question makes me think of a case I ran into a few years ago. The owner had modified his car but when he installed his fans, one of them was wired backwards so the fan ran in reverse. The two fans were fighting each other which was just like having no fan at all, so the car heated up while it was sitting still then it cooled off when moving. Check the rotation of both the fans before you check anything else. If that’s OK, you may be able to track down the problem with a non-contact thermometer, follow the course of the coolant with the beam. The radiator should be about 30 degrees or more cooler at the exit than at the entrance. If you need help with this, contact Your Mechanic. They can send a technician to your home to check out your overheating problem and let you know what can be done for it.

07 Honda Fit Code PO420. Car missing at idle when AC is on and has trouble accelerating, especially up hills, more so with AC on
ANSWER : Hi there.The catalytic converter has two oxygen sensors. One oxygen sensor is positioned in front (upstream) of the catalytic converter and the other oxygen sensor is positioned at the rear (downstream). If the upstream oxygen sensor is working properly, its readings should fluctuate from when the car is at operating temperature and when running in a closed loop. When the oxygen sensors have readings that are similar to each other, it is an indication that the catalytic converter is not working as intended. If the voltage of the downstream oxygen sensor decreases, and begins to fluctuate like the upstream oxygen sensor, it means that the oxygen levels are too high and the Powertrain Control Module (PCM) will store the P0420 trouble code. This could be caused by a cracked exhaust manifold, damaged sensors or catalytic converter or electrical harness that controls the the sensors. It would be a good idea to have a professional mechanic complete an engine is misfiring inspection.

2007 Nissan Altima motor mounts are new the motor vibrates a lot went the car is in drive with the ac on went I turn the ac off it
ANSWER : Hi there. It is possible that you have a vacuum leak or perhaps the transmission mounts are loose, as usually these symptoms are common with worn out motor mounts. When the AC is activated, it does create additional drag on the motor, which can make a small vibration even worse. It’s probably a good idea to have a professional mechanic come to your location and try and replicate the symptoms you are describing by completing a car is shaking or vibrating inspection.