Car power is very low while airconditioning is on

Tiny
MIRFANAWAN4U
  • MEMBER
  • 2005 MITSUBISHI LANCER
  • 1.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 62,000 MILES
Car acceleration is very good once car is taken up after D drive. When a/c put on, great drag felt and car is like not moving. If car is going in 60 speed and a/c puts to on, the speed gets almost stagnant. When a/c is on and car is stopped due to any reason, its very hard to pick it up again and a/c is to put off and then car accelerates.

I have got my a/c checked for any problem. Its compressor bearing was having some problem and same was replaced. However, even then, its hard to pick the vehicle with a/c on.

Car engine and auto transmission is checked by certified mechanic and all goes ok without a/c. But airconditiioning is killing car pick and acceleration. Dear I need some checks recommended by you in order to isolate the problem.

Waiting for your positive response
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Tuesday, July 1st, 2014 AT 8:54 AM

9 Replies

Tiny
RACEFAN966
  • EXPERT
I would check the compressor itself could be going bad causing to much drag and making it hard on the engine. Also the mechanic did check the Freon to make sure it wasn't overfull?
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Tuesday, July 1st, 2014 AT 9:55 AM
Tiny
MIRFANAWAN4U
  • MEMBER
Yes. The required amount of refrigerant 134a was filled
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Monday, July 7th, 2014 AT 3:03 PM
Tiny
RACEFAN966
  • EXPERT
Ok then turn the clutch by hand not the pulley the belt rides on but the clutch let me know on a scale of 1 to 10 how hard is it to turn, 1 easy 10 really hard ok.
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Wednesday, July 9th, 2014 AT 8:20 AM
Tiny
MIRFANAWAN4U
  • MEMBER
Dear my car is automatic. And I would like to update you that I have cleaned the car fuel system. Starting from tank, pump filter, delivery pipe, fuel injectors and pipe lines. Now problem is ok and car pick on airconditioning is good. Another question is cars' fuel economy is really pathetic. Its almost 7 kms per litre on good roads (city + airconditioning). What to check now?
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Sunday, July 13th, 2014 AT 11:51 AM
Tiny
RACEFAN966
  • EXPERT
I was referring to the air conditioning clutch I know the car is automatic lol. Anyway I would clean the mass air flow sensor and if there is a fuel filter change it and check the o2 sensors.
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Monday, July 14th, 2014 AT 8:11 AM
Tiny
MIRFANAWAN4U
  • MEMBER
Dear thanks for your reply
sorry I could not get you that you were talking about ac clutch? Is it in the compressor? If yes then I have changed its bearing and its now fine.
Mass flow senor is checked at your advice, it is working fine but its oval plastic inside body was found some what irregular like abrasive (rough)
but as that was working fine so I put it back
I will check o2 sensors and will let you know
still car is lagging and plus its fuel economy is drastic
I noticed now that it is giving almost 5 km in a litre
pl recommend elorborative checks for fuel economy?
Please
thanks and regards
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Sunday, July 20th, 2014 AT 1:15 PM
Tiny
RACEFAN966
  • EXPERT
Lets get the o2 sensor checked that will affect mpg a lot in some cases, when a car is running to rich that will affect performance too.
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Thursday, July 24th, 2014 AT 8:53 AM
Tiny
MIRFANAWAN4U
  • MEMBER
Dear, soon I will check that o2 sensor and will let you know
i got one mechanic last night and after checking he was saysing me that my car radiator fan are running constantly and thermostate valve is also extracted by some mechanic in past, thats why your fuel economy is very less.
Is he right? How car fuel economy is greatly affected by direct connection of radiator fans?

Pl tell me why my car radiator fan is direct? Is it faulty fan controller module?
Thanks
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Thursday, July 24th, 2014 AT 12:10 PM
Tiny
RACEFAN966
  • EXPERT
This could cause the bad mpg so that is correct as for the fan running all the time it will with the ac on but should only come on as needed when the ac is off. But the engine fan if drawing to much can put a strain on the electrical system and other problems
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Thursday, April 9th, 2015 AT 8:32 AM

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