Automotive Air Conditioning Information Forum

Part of the airflow restriction might have been the partially clogged cabin air filter. But if you suspect that the evaporator is icing-up, then it's most likely low on refrigerant.

As a first step, recover the R-1234yf, or have it done, and see how much refrigerant comes out. If the weight of the ...

Back in the days when the Dakota used R-12 refrigerant (1993 and earlier), the specs I have for that vehicle are 40 ounces net weight (2.5 pounds) of R-12, and 7.5 fluid ounces of Mineral Oil. I don't have any specs for the 1971 Scamp with the Slant Six.

With that being said, I'm not an A/C system ...

Nice vehicles, and the new logo looks great!

It certainly seems like the Blend Door Actuator is receiving a false signal. But before we go to the control module again, let's examine a few other things that you might be overlooking.

Seems simple, but have you checked the cabin air filter? A partially clogged or fully clogged filter sometimes ...

If memory serves, Mahle bought out RTI ten or 15 years ago. I never owned an RTI machine, so I don't know whether parts are still available.

My guess is that Mahle gave up the old RTI product lines, along with parts production, due to lack-of-market. In today's digital-centric world, I doubt that ...

It sounds to me like the refrigerant charge is "off." What does the under-hood decal say about the amount of R-12 that should be in it? Does the evaporator freeze-up the way it is?

The system still might have a leak, and/or could have air and moisture in the system.

A system that holds vacuum is ...

I don't know what area of the country in which you live, but any of the major automotive flea markets, like Carlisle or Hershey—held every Fall in Pennsylvania—can occasionally turn-up used machines. On-line auctions are another source.

However, the phrase *caveat emptor* comes to mind. Often ...

Unfortunately, I don't have access to the specs for your vehicle because I'm in the USA. However, there are some clues that might point us in the right direction.


Yes, the compressor runs all the time, there is no magnetic clutch.
A clutchless compressor that runs all the time must be a variable ...

Kindly post the year, make, model, engine size, and mileage for your vehicle. Is this a US-spec or non-US-spec vehicle?


My question is regarding constantly running ac compressors.
Your topic says, in part: "...re constantly running ac compressors." And your post above states essentially the same ...

grumpy old man wrote: Mon Mar 30, 2026 2:18 pm ...I think it is classic air. Had I known about them I would have gone that route but 20 20 vision is only hindsight.

My thought, too. There are a few of those companies around: Classic Auto Air, Old Air Products, Vintage Air, et al. .