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Genchi Genbutsu
Genchi Genbutsu, Toyota Master Technician
Category: Toyota
Satisfied Customers: 4394
Experience:  Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
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2000 toyota celica a/c light blinking

Customer Question

2000 toyota celica a/c light blinking
Submitted: 1 year ago.
Category: Toyota
Expert:  Virtual Wrench replied 1 year ago.

Hello,

That generally means the system needs to be recharged. Has it been working up until this point?

Customer: replied 1 year ago.

Hi well I replace the condenser so I van recharge system it had a leak now I did vacuum and I star charging the system compressor clutch kicks in also fans but only for 5 seconds than both stop and light star flashing

Customer: replied 1 year ago.

Also my low side is about 50 and high side is about 100

Customer: replied 1 year ago.

I have swap the magnet clutch relay too

Expert:  Virtual Wrench replied 1 year ago.

Hi,

Those pressures are low. You need to add more.

The light flashes when the compressor is not kicked in. If it's low it wont kick in long enough.

You want the high side to be around 200 psi and then the low side will drop to about 30 or around there. It all depends on how hot it is outside.

Add more and i bet the compressor stays on longer.

Customer: replied 1 year ago.

It just wont take it I tried

Customer: replied 1 year ago.

I even jump the wires at the pressure sensor but it won't stay on

Expert:  Virtual Wrench replied 1 year ago.
Get a container of real hot water and place the can of 134a in it. NOT upside down. Just sit it in the hot water and it will make it transfer a lot faster. You should not have to jumper anything. It will only take it in when the compressor is on so it may take awhile but the hot water works good.

try that and let me know
Customer: replied 1 year ago.

Compressor won't kick back by it self after light stars flashing

Expert:  Virtual Wrench replied 1 year ago.

Watch this video. Its for a camry but should be the same.

https://www.youtube.com/watch?v=b-oETQXoe0g

Customer: replied 1 year ago.

Thanks but I did try tgat already

Expert:  Virtual Wrench replied 1 year ago.

Sorry but that's all i can do from here so i will see if someone else has any ideas. Good luck bud...

LJ

Expert:  Genchi Genbutsu replied 1 year ago.

Do you still need help with this Celica a/c concern?

Customer: replied 1 year ago.

Yes I still need help

Expert:  Genchi Genbutsu replied 1 year ago.

Great, I think we should break this problem down into several steps. First lets start from the beginning, why did you start working on this a/c system?

Customer: replied 1 year ago.

Cause it wasn't working

Expert:  Genchi Genbutsu replied 1 year ago.

So it wasn't blowing cold air? Or was the a/c light blinking then also?

Customer: replied 1 year ago.

Wasn't blowing cold

Expert:  Genchi Genbutsu replied 1 year ago.

Thanks. So I see that it want blowing cold and I take it that you found a leak at the condenser and that's why you replaced it.

Now before this repair, we couldn't even test the system to see if the a/c light was blinking, correct?

Customer: replied 1 year ago.

Correct

Expert:  Genchi Genbutsu replied 1 year ago.

So from what I'm understanding, this blinking a/c light could've been pre existing condition and we just didn't know it because the system wasn't even working when it came in.

What brand compressor is installed on this Celica? Is it the original OEM Toyota one?

Customer: replied 1 year ago.

Probably yes, don't know the brand.

Expert:  Genchi Genbutsu replied 1 year ago.

Ok. The reason that the a/c light blinks is because the a/c amplifier (a/c ECU) is seeing the drive belt slip, or at least it thinks that it is. This logic is programmed into the a/c amplifier and what it does is compare the rpm's of the engine to the rpm's of the compressor.

If everything is working normally they rpm's will be the same. If the drive belt is slipping like the car was just driven through a large puddle of water, then the rpm's won't match and the a/c amplifier will see this. It will then turn off the power to the compressor and blink the a/c light to warn the driver.

What we see most often is that the rpm signal generator on the compressor goes bad and this is the cause of the blinking light. Yes, we did have an issue with the MGT clutch relay but you have already replaced it I see. So that can be ruled out as a cause. Does this make sense?

Customer: replied 1 year ago.

Yes I have swap the horn relay to the MGT clutch and I still have the same issue

Expert:  Genchi Genbutsu replied 1 year ago.

The revolution sensor is not in the clutch, it's in the compressor itself.

Customer: replied 1 year ago.

Ok so replacing the compressor should fix my problem

Expert:  Genchi Genbutsu replied 1 year ago.

Yes. I'm glad that I was clear in my description and was able to help you. :)

Customer: replied 1 year ago.

Ok will try that and will get back to you later

Expert:  Genchi Genbutsu replied 1 year ago.

Ok cool.