charlie44nike:
My car ac fan comes on a few minutes after I switch off my engine. It blows for a while and later goes off by itself. What could be the cause?

9icetoo:
gazzuzz, my Ac matter don tire me. like u rightly guessed, my compressor was weak. I changed it. while changing it, we discovered it has already started wearing itself out and had deposited the black fluid in the lines and condenser. while flushing the lines and condenser, plastic particles (apparently stripped from one of the Ac lines) was shooting out of the condenser. a decision was made to replace the condenser with a new one.
so a tokunbo compressor was installed, some suspect hoses replaced, all hoses flushed, evaporator flushed (in situ with expansion valve). the expansion valve and evaporator were not pulled out but were flushed with a vulcanizers machine while in place. (its a nightmare to loosen the dashboard of the Octavia to get to the evaporator).
however after this fix, Ac worked well for only three days and packed up again. I checked the low pressure line for gas and the black goo came out again. meaning the compressor has worn itself out again after 3 days!. its costing me a fortune to fix this Ac. what do you advise as the way forward?

9icetoo:
gazzuzz, my Ac matter don tire me. like u rightly guessed, my compressor was weak. I changed it. while changing it, we discovered it has already started wearing itself out and had deposited the black fluid in the lines and condenser. while flushing the lines and condenser, plastic particles (apparently stripped from one of the Ac lines) was shooting out of the condenser. a decision was made to replace the condenser with a new one.
so a tokunbo compressor was installed, some suspect hoses replaced, all hoses flushed, evaporator flushed (in situ with expansion valve). the expansion valve and evaporator were not pulled out but were flushed with a vulcanizers machine while in place. (its a nightmare to loosen the dashboard of the Octavia to get to the evaporator).
however after this fix, Ac worked well for only three days and packed up again. I checked the low pressure line for gas and the black goo came out again. meaning the compressor has worn itself out again after 3 days!. its costing me a fortune to fix this Ac. what do you advise as the way forward?

mayor2013:


Fresh installation is the way forward. For the fact that the expansion valve was not replaced and evaporator.The problem would be there

GAZZUZZ:


I see you have taken up a new hobby.

GAZZUZZ:


what type of car?

charlie44nike:
Volvo s80

I'm not very Familiar with the electronics of that vehicle, but when the coolant temp of a vehicle exceeds it's safe limits, the fan will come on and stay on until it drops to friendly values . Now in most cars (Japanese and korean) if the coolant temp exceeds normal limits and the ignition is turned off, fans will stop spinning, but other vehicles like (peugeot) will keep the fans running until temp drops to about 90degrees centigrade.

Summary, your coolant temp is exceeding normal values, have it checked sir.

GAZZUZZ:


compressor is not faulty, most likely the bearing in the pulley. It is an easy straight forward fix, that can be done some times without discharging the Gas in the system.


Look at the pic below

Replace bearing and noise should go away.


P.S hope you are sure the noise is from compressor area?

GAZZUZZ:


I'm not very Familiar with the electronics of that vehicle, but when the coolant temp of a vehicle exceeds it's safe limits, the fan will come on and stay on until it drops to friendly values . Now in most cars (Japanese and korean) if the coolant temp exceeds normal limits and the ignition is turned off, fans will stop spinning, but other vehicles like (peugeot) will keep the fans running until temp drops to about 90degrees centigrade.

Summary, your coolant temp is exceeding normal values, have it checked sir.

charlie44nike:


Thanks gazzuz. But what if it's not the fan? What If it is the ac itself that comes on after the car engine is switched off?

9icetoo:

the Ac cannot come on after the engine is switched off. the compressor which is the main component in your Ac cannot work without your engine. like Gazzuzz explained, your coolant temp is high which triggers the fan to come on. it happens on my Skoda too. the fans come on sometimes after I turn off the car usually after long drives with the Ac on. the condenser heats up my radiator which turns on the fans briefly to bring the temp down. its normal. it is even written in my car manual. read your owners manual, it may be written there too.

ojtopsy:
Gazuz my AC works well in the morning but not effective in the afternoon. It's a 2001camry.

GAZZUZZ:

Low charge, Defective compressor, defective cooling fans, Defective. Expansion valve.

ojtopsy:

Which kind wahala is this is it that all of them are bad or any one of the above.

GAZZUZZ:

Low charge, Defective compressor, defective cooling fans, Defective. Expansion valve.

ojtopsy:
Thanks for your response. I can relate with others except for the low charge. Please explain. The cooling fans is working if not, overheating supposed to happen. Or does AC have a different fan,?

GAZZUZZ:
If you have vehicle air-conditioning issues, or want to learn more about how the system works, this thread is for you.

Also there is a whatsapp group for any one who wants further consultation on a.c issues.

Contact me on 08033910382 and you will be added.

Ovipop:
thanks boss for this wonderful tips ...the evaporator of my Bmw e36 compact coupe was leaking and I could not find the evaporator to buy so I decided to block off the mouth that was leaking ... I don't know if it is a safe practice or if it will work well ..

austin4real:
Hi, Please my nissan primera AC stopped working like last week, the AC techie checked all the pipes and compressor for any physical leaks, but none was found, he then concluded that the evaporator was the culprit, The compressor activates whenever i switch on the AC, but it doesnt blow cool air, what can be done plz.....

Jerri7:
I have a Toyota corolla 09 and the AC works fine except that whenever I enter traffic, the AC starts blowing hot. But immediately I leave the traffic and start accelerating again, the AC picks up. Please what can be the best way out? I have also searched some online Toyota forum but they couldn't provide answer

GAZZUZZ:



Defective compressor.

Jerri7:


Thanks for the response. Pls what is the average price of the compressor before I am fleeced by our people.

brand new OEM denso 150k condenser OEM 50k.

GAZZUZZ:


brand new OEM denso 150k condenser OEM 50k.

Inception:

Is this the price for the one with variable displacement?

GAZZUZZ:


Take a pic, of what was blocked.

pobeaf:
I always put my car ac into highest, yet the people at the back don't feel it much. Gazzuzz or any other person, can you please recommend somebody who can help me fix the problem here in Ibadan. The car is 2004 Toyota corolla sport. I will appreciate your prompt reply sir