honmusa:
compressor is a considerable big load on the engine and dmyour engine need to work relatively harder to accommodate this extra load and still maintain the same performance .This extra load on the engine will result to increase in rate of wear and tear in the engine compared to engine without compressor load .The effect will even been more if the engine lack the necessary maintance requirement.
I will advice you only use the AC when necessary and adhere to schedule maintaince standard required for the car.

Siena:
For those clinging blindly to Mercedes-Benz, who assume the use of air conditioning has no adverse effect on the engine, think again.

All engines have a service life. Every load placed on an engine WILL reduce its working life by a certain amount.

Alternators, power steering pumps, superchargers, aircon compressors are all additional loads. Even the weight of the vehicle itself is a load, so is the gearbox, worse when too high a gear is selected for a relatively low speed. The more load is placed upon an engine, the harder it has to work. The main bearings of the crankshaft are the most stressed parts of any engine. When the aircon compressor is active, the crankshaft will ALWAYS automatically attempt to move away from the direction of load and rotation, regardless of engine manufacturer. This is the thrust angle, and is what causes crankshaft bearings to wear more on one end than the other, giving the characteristic engine "knocked" scenario.

This is NOT my opinion, it's a scientific fact.

And it's something our dear Nigerian mechanics picked up very early, as far back as in the 1970's. Once an engine had had a crank regrind, and was fitted with undersize bearings, they tended to NOT fit the aircon compressor, stating "the engine no fit carry am". As a child, I wondered what they meant, and it was when I was in my mid teens I understood. A reground crank is thinner on the main journals, as metal has been removed. So statistically, it is weaker than a standard crank with thicker journals and will be MORE LIKELY to suffer damage from over loading due to an increased thrust angle. Our mechanics were NOT trained back then, but they understood the concept of increased load and thrust, and how it acted on a reground crank.

All engines are designed to give a reasonable service life, and are built with loading taken into consideration. Unles you're really anal, you won't think of turning off your aircon to increase engine service life (who does that?) but it's something to be aware of. At some point in time, your engine will either require a rebuild, or a replacement. Sometimes as early as 200,000 miles, or as late as 500,000 miles. There's a massive variation in the service life of automobile engines, we just accept it as normal wear and tear, and seldom question WHY.

bettercreature:
You actually dont know anything

Siena:
For those clinging blindly to Mercedes-Benz, who assume the use of air conditioning has no adverse effect on the engine, think again.

All engines have a service life. Every load placed on an engine WILL reduce its working life by a certain amount.

Alternators, power steering pumps, superchargers, aircon compressors are all additional loads. Even the weight of the vehicle itself is a load, so is the gearbox, worse when too high a gear is selected for a relatively low speed. The more load is placed upon an engine, the harder it has to work. The main bearings of the crankshaft are the most stressed parts of any engine. When the aircon compressor is active, the crankshaft will ALWAYS automatically attempt to move away from the direction of load and rotation, regardless of engine manufacturer. This is the thrust angle, and is what causes crankshaft bearings to wear more on one end than the other, giving the characteristic engine "knocked" scenario.

This is NOT my opinion, it's a scientific fact.

And it's something our dear Nigerian mechanics picked up very early, as far back as in the 1970's. Once an engine had had a crank regrind, and was fitted with undersize bearings, they tended to NOT fit the aircon compressor, stating "the engine no fit carry am". As a child, I wondered what they meant, and it was when I was in my mid teens I understood. A reground crank is thinner on the main journals, as metal has been removed. So statistically, it is weaker than a standard crank with thicker journals and will be MORE LIKELY to suffer damage from over loading due to an increased thrust angle. Our mechanics were NOT trained back then, but they understood the concept of increased load and thrust, and how it acted on a reground crank.

All engines are designed to give a reasonable service life, and are built with loading taken into consideration. Unles you're really anal, you won't think of turning off your aircon to increase engine service life (who does that?) but it's something to be aware of. At some point in time, your engine will either require a rebuild, or a replacement. Sometimes as early as 200,000 miles, or as late as 500,000 miles. There's a massive variation in the service life of automobile engines, we just accept it as normal wear and tear, and seldom question WHY.

adeniyisavage:



In others words.. It affects engine

Stallione:
it doesnt affect the engine atal atal,just change engine oil every 2months,depending on how u move abt,so it'l make the engine smooth when on,i do change my corrolla every 2months,atimes 3 and it must be 2nd wk of the 3rd months.Some people advice u not 2put ac when ua not in montion,dats not true,on ur ac anytime u want as long as its factory fitted.

Siena:


You must be spending as much on oil and filter changes as you do on fuel.

Your Toyota Corolla needs to be serviced very 10,000 miles or 12 months, whichever occurs first. You're simply wasting money.

edoziebobbyyahoocom:
It has effects because of late my tundra's engine sound changes whenever i put on the ac. Taking it for check up very soon.

amzee:
It doesnt have any effect on your car if your engine is in good and stable condition. Dont use your car A/C if you know that your car engine is smoking,Alternator not charging,A/C belt making noise due to its looseness.


Car A/C Expert.

edoziebobbyyahoocom:
It has effects because of late my tundra's engine sound changes whenever i put on the ac. Taking it for check up very soon.

Stancity:
Yeah he's wasting money indeed. I wanted putting mouth on that before your comment came in.

Walexz02:
Just make sure you do your normal maintenance.. The effect will be minimal and negligible .
And please don't on the Ac when the car is not in motion, that too I think would help.

charlesadeoye:
lol. he is not wasting money. He uses a 20w-50 oil perhaps, so what do you think? The oil viscocity thins off after a 1000 mile or so...

tkovie2002:
I don't think it has any effect whatsoever. The manufacturer of the car must have factored in the load of an air conditioner on the engine and made sure that the engine is capable of running even at full capacity with A/C on without having any effects as long as proper maintenance is done before selling to consumers.

Most of us in Nigeria don't even run our engine to full capacity due to traffic jams and bad roads so that shouldn't be an issue. I feel the "increased wear and tear" of an engine due to constant use of air conditioner is an unfounded Nigerian idea.

shenney:

Exactly!!!.. You ve said my mind.. I have a toyota camry that the AC is always on anytime the car is working and I can tell you the car is almost 4 years now with no side effect and no much difference in the fuel consumption rate with AC or not. Its just the nigerian poverty mentality. Please enjoy this life. My engine is very sound.

abere888:

No, it has no effect on the engine but it consumes fuel ⛽

Siena:


You must be spending as much on oil and filter changes as you do on fuel.

Your Toyota Corolla needs to be serviced very 10,000 miles or 12 months, whichever occurs first. You're simply wasting money.