AC Problem with error code 66
Registered User
Joined: Jun 2009
Posts: 15,116
From: southeastern Michigan
Can you provide more details about what the A/C does or does not do?
According to this forum, code 66 indicates low freon.
http://www.automotiveforums.com/t881...n_startup.html
According to this forum, code 66 indicates low freon.
http://www.automotiveforums.com/t881...n_startup.html
Thread Starter
Registered User
Joined: Dec 2013
Posts: 10
Sorry jaunty, thanks for the reply, and to be honest I typed a whole paragraph of the situation and went to post it. The forum asked me to log in and then it caused all my message to get deleted.
So I was frustrated and took the lazy way out and just posted a very brief question.... here goes another try of a summary to what I already had typed:
My 1993 Oldsmobile regency shows error code 66 on the panel. This usually indicates low freon which is NOT the case.
Troubleshooting:
jumped the relay and was able to bypass the temp controller. the ac compressor turned over and then there was cold air.
tried only to bypass the 'low pressure sensor' in which the problem was still there...
changed the temperature control module with one I pulled from a scrapyard which still showed the same problem
Question:
Anything I may be missing? We think it may be the programmer or even another sensor. I am hoping to get some advice of what may be the most probable cause of this issue.
So I was frustrated and took the lazy way out and just posted a very brief question.... here goes another try of a summary to what I already had typed:
My 1993 Oldsmobile regency shows error code 66 on the panel. This usually indicates low freon which is NOT the case.
Troubleshooting:
jumped the relay and was able to bypass the temp controller. the ac compressor turned over and then there was cold air.
tried only to bypass the 'low pressure sensor' in which the problem was still there...
changed the temperature control module with one I pulled from a scrapyard which still showed the same problem
Question:
Anything I may be missing? We think it may be the programmer or even another sensor. I am hoping to get some advice of what may be the most probable cause of this issue.
Registered User
Joined: Jun 2009
Posts: 15,116
From: southeastern Michigan
I don't know much about these systems, but I would think that if the code is indicating low freon, either there IS low freon, or the system thinks there's low freon, which suggests a bad sensor. Is there a sensor for this? Have you checked it?
By the '90s, these systems were starting to get more and more computer controlled, and it may not be that easy for a shade-tree mechanic to fix. You could spend half a lifetime changing parts, like you did with the temperature control module, in the hopes that the problem is fixed, or you could take it to a shop, let them check it out, and see what they say.
By the '90s, these systems were starting to get more and more computer controlled, and it may not be that easy for a shade-tree mechanic to fix. You could spend half a lifetime changing parts, like you did with the temperature control module, in the hopes that the problem is fixed, or you could take it to a shop, let them check it out, and see what they say.
Thread Starter
Registered User
Joined: Dec 2013
Posts: 10
I don't know much about these systems, but I would think that if the code is indicating low freon, either there IS low freon, or the system thinks there's low freon, which suggests a bad sensor. Is there a sensor for this? Have you checked it?
By the '90s, these systems were starting to get more and more computer controlled, and it may not be that easy for a shade-tree mechanic to fix. You could spend half a lifetime changing parts, like you did with the temperature control module, in the hopes that the problem is fixed, or you could take it to a shop, let them check it out, and see what they say.
By the '90s, these systems were starting to get more and more computer controlled, and it may not be that easy for a shade-tree mechanic to fix. You could spend half a lifetime changing parts, like you did with the temperature control module, in the hopes that the problem is fixed, or you could take it to a shop, let them check it out, and see what they say.
Good thought. There definitely is freon. We've practically emptied and refilled it twice, and then dye checked it.
We go for the choice where the system THINKS there's low freon. Just not sure what sensor it could be since there are many
---
I took it to a shop and they gave me the runaround, most probably since the car is old (which I'm sure most other shops would as well). Though, I called around and described the problem to a few shops and each one said; the temp control module, ac compressor, low pressure switch [in this order].
Seems like we ruled out all of those.
Registered User
Joined: Jun 2009
Posts: 15,116
From: southeastern Michigan
I'm surprised you're having a hard time getting a shop to help. Your car is old but not that old. I took my '73 wagon to a local shop to have them completely renew the A/C system, including updating to the R134 refrigerant. They did a great job, and there was no hesitation on their part because the car was 40 years old. Yours is half that age. I'd keep looking for a shop.
Thread Starter
Registered User
Joined: Dec 2013
Posts: 10
I'm surprised you're having a hard time getting a shop to help. Your car is old but not that old. I took my '73 wagon to a local shop to have them completely renew the A/C system, including updating to the R134 refrigerant. They did a great job, and there was no hesitation on their part because the car was 40 years old. Yours is half that age. I'd keep looking for a shop.
If anyone else has anything, I hope they'll chime in, otherwise I'll need to make time to bring it to a shop. Kind of hard for me since I'm always needing to drive somewhere.
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