I dont think my AC works.What should I start checking?I dont even knows if the compressor starts.I just get the fail code 00 on codenummber 36 that is(I think) how long the compressor goes....maby I should buy a moped.. :lolg:

 

I am a little confused regarding a code 36 because no such code exists. There is however a diagnostic parameter wich is 36 which has to do the the number of times below critical time.

Trouble codes are not stored on the C68 unit. You have to monitor them when they occur. The next time you drive the car, turn the AC on and press and hold the up and down fan arrows at the same time until the "00" flashes. The drive as normal and watch for one of the green lights to start flashing. It is at that moment that you will see a code.

Jot down what you see and re-post.

 

Oki...thanx!! :cheers:

 

Maby the lowpressure sensor is failing.Can I bypass it somehow without killing something?And where is it located?

 

The pressure sensor is on the A/C line on the passenger side of the car, near the firewall. However, I think you are getting ahead of yourself. Read the codes first, and let me know what they are.

 

Yeah...maby you are right.I will check them to day.Thanx for your help!! :cheers:

 

Yep...one of the green diods was blinking when I drove to work!But just as I was going to check the codes I almost smashed a truck!ha ha!But I will take some time tonight and check it. :troll

 

Enter the diagnosis mode immediately after starting you car and setting the AC for your desires. Make sure and hold down up and down fan arrows at the same time for at least 5 seconds or until you get the -00. Next press the auto fan button. Now you should see 00. Just drive as normal until the light starts blinking. Then all you have to do is look at the code. It does not harm the system to drive around in the diagnosis mode...in fact it is the most reliable way to get the error codes

Below is a list of the error codes you may see. Also here is the link of a very informative page.

http://www.idavette.net/tech/c4diag.htm

System Faults

(one of these will be set if your air conditioning controls have an LED flashing)
00=No Faults

01= Temp Door Motor Circuit Fault

02= Temp Door Motor Circuit Fault

03 = Ambient Sensor Open

04 = Ambient Sensor Short

05 = In-Vehicle Temp Sensor Open

06 = In-Vehicle Temp Sensor Short

07 = Solar Load Sensor Open

08 = Solar Load Sensor Short

09 = Low Freon Detected

10 = UART Failure

 

I did check it last nigt.And I got a 09 code on the 00 parameter.I guess its must be lowfreon!The parameters 35 and 36 was just 00.
Is it expensive to fill it up(here in sweden if anyone knows)?And must the system be checked for leaks?
Thanx for the help again!

 

Your are correct, the code 09 means low freon. The 92 came with R12, which has since been replaced with R-134. Here in the US, it is easy to get the R-12 refilled, however it is several times more expensive then the R-134. Many people opt to convert to 134, since the conversion and fill is often less expensive than a refill with R-12. Some people claim that 134 is not as cold as 12, and while this may be the case, if your system is working correctly, you will stay nice and cool. I did the conversion myself ( it only took about 1 1/2 hours). As for it being cold, I live in South Florida where it gets very hot 8 months out of the year, and to tell the truth, I have to turn my A/C down from time to time.

The converstion to 134 is easy, all it takes is new seals on the lines going to the compressor, a new dryer/accumulator (the big silver cylinder between the radiator and the waterpump) and an orifice tube, which is inserted in the line before it enters the evaporator near the low freon sensor.

However, one very important thing to think about is now that the system is low on freon, how did it get low. You must make sure and find the leak. Do a visual inspecton and look for obvious signs of an oily residue, then take corrective action. If you can't visually recognize the damaged or leaking area, do the conversion, then have it leak checked when it is recharged.

 

PTz-92-LT1,
When you did your conversion, did you use factory parts for a later model corvette ? I have a 93 and I am considering the conversion. I would like to use factory parts.

Thanks in advance
:cheers:

 

Can you buy some coversion kit?And is it expensive? :rolleyes:

 

i bought a conversion kit for my 85 from Advanced auto for $25 on sale. The car blows cool air, now if i could just figure out how to get the high fan setting to work ?

I didn't change any seals or accumulator/dryer as the kit didn't recommend to do so....maybe i should of, i don't know.

 

I'll bet your fan is blowing on high Mike. Check this out:

Cleaning the A/C Evaporator Coils:

Here's how I did it on my 1992 LT1 Coupe:

1. Jack up the front of the car and removed the right front wheel
2. Remove the rear half of the fender well liner
3. Drain and remove the windshield washer reservoir, making sure to unplug the sensor
4. Unplug and remove the blower relay
5. Remove the cross brace that runs between the frame and firewall
6. Remove the blower assembly
7. Remove the heater hoses from the heater core, be prepared to lose a little coolant
8. Remove all the screws that attach the passenger side of the blower housing to the firewall
9. Remove the screws that hold the passenger half of the housing to the driver side half
10. Carefully split the housing at the evaporator split line, leave the monkey poopie in place
11. The air flow inlet side of the evaporator will be facing the passenger side
12. If it is like mine, it will be caked with an oily/tar dirt




Close-up View ~ Yikes



13. Gently remove as much of the bulk as possible
14. Line the bottom of the evaporator coil with rags
15. Spray disk brake cleaner into the evaporator coils to remove the oil and grease
16. Try to have access to an air compressor so that you can vaporize as much cleaner as possible

[img]http://temp.corvetteforum.net/c4/purplec4//clean_evaporater_wide_view.jpg[/img

17. The air flow outlet side of the evaporator will not be dirty. Don’t mess with it
18. Reverse the steps to re-assemble
19. Re-use the monkey poopie to seal the air around the evaporator inlet and outlet lines

Now ~ crank the A/C, put on some great tunes, and go for a cruise…..

~ Purp

 

thanks purple C4 , mine might look like that too but i have looked into this before and if i put my ear right by the blower motor as soon as you turn the dial to high, it completly shuts off.

I remember someone suggesting it was a ground wire back by the drivers side valve cover and i looked,looked and looked and couldn't find it. I have power to the relay at the orange wire which is the high setting according to the schmatic. All that checks out fine, so i changed the relay with one from autozone and then it blows the AC fuse ( if i remember correctly) so i gave up on it as at that time i didn't need the high setting for heat? Now however i would like to have it

 

Ron 93 Vette - I purchased the drier, seals and orifice tube from from Discount Auto Parts in May of 02. The drier was 42.99, orifice tube 2.99 and seals 5.99.

 

Mike 1985 - I had the same problem three years ago. Replaced the fan with a GM one # 52466080 for $94.50. Has worked fine ever since.

 

Corvettehumlan - For all the parts described above, it should be around $50 US. Don't know what parts are available where you are. Also keep in mind that you may be in for replacing hoses, evaporator or condensor if the leak is anywhere around there. But you won't know that until it's charged.

Here is another thought...there are a lot a places around here that offer a free AC check (this is in hopes that something is wrong and they get to charge you for the repair). They charge the system, check for leaks and then drain the freon and give you a report. It is normal for an AC system to lose some coolent over time, you may a perfectly good system and it just needs charged.

Whatever the case, you must get it checked for leaks.

 

If you need someone here in the states to buy something and ship it to you just let us know. We can work out the payment details. I just bought a set of plug wires and shipped them to Poland the other day.

~ Purp

 

Hi Corvette friend - I have a 1992 factory manual that I can ship to you at no cost, if you are interested. Last year, my beautiful black '92 coupe was totaled by an SUV, I have replaced it with a 1993 40th Anniversary coupe with 27,00 miles on it. I am 70 years of age and drive my baby daily. Just send me your address.
Jerry N. Ventre
Henderson, NV
ventrej@msn.com