Hello guys, please I will like to know of any problem associated with fixing a non-factory airconditioning system in a car with engine capacity of 1.6 ltrs or in any engine. Thanks for your contributions.

Still waiting for comments from gurus in the forum.

can be done

It depends on how competent d installer is but 1) u could experience water leaks into the car.
2) tha aircon might not cool as well as factory fitted
3) the cold air might not evenly come out of all the vents ie driver might enjoy while passenger just gets warm air
4) If ur car never had provision for aircon programmed into the ecu,u will experience reduction in rpm everytime u switch on d aircon. This could cause stallin at odd times.
5) u could experience overheatin and might need to upgrade ur fans/radiators in extreme cases.

Nonetheless, these shouldnt stop u. Try and use installers that people av used and can vouch for. I av had 2 cars with after-buy aircon.

flexya: It depends on how competent d installer is but 1) u could experience water leaks into the car.
2) tha aircon might not cool as well as factory fitted
3) the cold air might not evenly come out of all the vents ie driver might enjoy while passenger just gets warm air
4) If ur car never had provision for aircon programmed into the ecu,u will experience reduction in rpm everytime u switch on d aircon. This could cause stallin at odd times.
5) u could experience overheatin and might need to upgrade ur fans/radiators in extreme cases.

Nonetheless, these shouldnt stop u. Try and use installers that people av used and can vouch for. I av had 2 cars with after-buy aircon.

. I disagree with you in no 4. The rpm always go down even on factory fitted cars.

CHIMCO: . I disagree with you in no 4. The rpm always go down even on factory fitted cars.

Flexya is correct in his number 4 statement.

On factory fitted ac systems, there is usually a compensatory device for stabilising the rpm when the ac is switched on. The device is usually a vacuum operated throttle advance compensator designed to keep the revs at a stable 750-850 rpm.

It can also be programmed through the ecu to perform the same function by increasing the rpm to keep a stable idling speed. The ecu identifies that the ac has been switched on and communicates to the electronic stepper motor to advance the rpm in order to compensate for the load from the ac compressor on the engine and regulates the rpm as and when ever the compressor clutch engages.

If an ac system is fitted as an after thought on cars with ecu controlled electronic stepper motors, the ecu may have to be re-mapped with the adaptation protocol for idle speed compensation when ac is in operation.

Obviously, if these devices are not present, the car engine would not be able to maintain the idle speed rpms.

Number 4 is a valid point.

Car-Doctor.

car-doctor:


Flexya is correct in his number 4 statement.

On factory fitted ac systems, there is usually a compensatory device for stabilising the rpm when the ac is switched on. The device is usually a vacuum operated throttle advance compensator designed to keep the revs at a stable 750-850 rpm.

It can also be programmed through the ecu to perform the same function by increasing the rpm to keep a stable idling speed. The ecu identifies that the ac has been switched on and communicates to the electronic stepper motor to advance the rpm in order to compensate for the load from the ac compressor on the engine and regulates the rpm as and when ever the compressor clutch engages.

If an ac system is fitted as an after thought on cars with ecu controlled electronic stepper motors, the ecu may have to be re-mapped with the adaptation protocol for idle speed compensation when ac is in operation.

Obviously, if these devices are not present, the car engine would not be able to maintain the idle speed rpms.

Number 4 is a valid point.

Car-Doctor.

It depends.

My Bosch LH2-2 system is programmed such that the rpm will always remain at 750 rpm, irrespective of the load on the engine, via the help of Idle Regulation solenoid valve. The injection and Ignition ECUs controls this valve.

Yes, the rpm will drop when the A/C is switched on, but will climb back to where it was before (750 rpm), whether the climate control ECU is connected to the Injection and Ignition ECUs,as long as one doesnt mess up the factory throttle adjustment on the throttle stop on the throttle body. That i can tell you. I know exactly how my Bosch LH2-2 system in my 505 V6 works and can tell you what you said about point 4 doesnt apply to that system.

Like i earlier said, it depends on the system we are talking about.

Ikenna

My camry normally idles just a little below 1000 rpm. It rises a little as ac is switched on and comes back to the original position again. Even when I messed up the throttle body one day, it worked erratically that day and became normal itself before the end of that day.

@Ik and car doctor my w202 c180 refuses to compensate for the load! goes off atimes! Please advice needed.

Ikenna351:

It depends.

My Bosch LH2-2 system is programmed such that the rpm will always remain at 750 rpm, irrespective of the load on the engine, via the help of Idle Regulation solenoid valve. The injection and Ignition ECUs controls this valve.

Yes, the rpm will drop when the A/C is switched on, but will climb back to where it was before (750 rpm), whether the climate control ECU is connected to the Injection and Ignition ECUs,as long as one doesnt mess up the factory throttle adjustment on the throttle stop on the throttle body. That i can tell you. I know exactly how my Bosch LH2-2 system in my 505 V6 works and can tell you what you said about point 4 doesnt apply to that system.

Like i earlier said, it depends on the system we are talking about.

Ikenna

smartchoice: @Ik and car doctor my w202 c180 refuses to compensate for the load! goes off atimes! Please advice needed.

Sorry, i cant help you on this, since i do not understand your car systems.

Ikenna

Thanks for the response so far. My major concern is what is the short or long term effect on car engine?

CHIMCO: . I disagree with you in no 4. The rpm always go down even on factory fitted cars.

Thats not true , rather it goes up, my w202 c180 remains(it usually drops and return back to it place 700rpm), but my neighbors w203 c200 kompressor usually goes up rather from 500rpm to 650 rpm each time he switches on the ac..and thers usually no lagging time , definitely no loss of power nor retardation at all.His factory ac is superp

that no 4 is very correct. this is also very correct

On factory fitted ac systems, there
is usually a compensatory device
for stabilising the rpm when the ac
is switched on. The device is
usually a vacuum operated throttle
advance compensator designed to
keep the revs at a stable 750-850
rpm.

another problem maybe lose of hp as the engine gets old. so many of us don't understand engine. on no account a new car fitted with 230hp engine will remain the same after 5 years. some may even lose close to 70hp depending on the maintenance and mileage . if your car was fitted with 230hp - 70hp = 150hp. if is 90hp-30hp =60hp. this will affect engine general performance

This is interesting.