90 S4 AC relay stumper
#16
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Nice work Bill. Agreed, shop time to diagnose would have been very expensive. How's the refrigerant level and how cold does it get at the vents?
Mine took 1.5 pounds a couple of weeks ago. I recall it needed R134 also the prior year. I understand the R134 refrigerant molecules are smaller than R12 and can leak out more. Anyway, my A/C is super cold, even in high humidity.
Mine took 1.5 pounds a couple of weeks ago. I recall it needed R134 also the prior year. I understand the R134 refrigerant molecules are smaller than R12 and can leak out more. Anyway, my A/C is super cold, even in high humidity.
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This car seems to be leak-free. It's R-134a and I checked the pressures and scanned the likely leak spots with a sniffer before I started to work on it. I haven't measured temps at the vent, but they are cold. It was about 90F today and the vents were cold. You know my 89 with R-12 blows in the 20s.
A 94 GTS is equipped with barrier hoses designed for R-134a - the R-134 shouldn't leak through them. 1.5 lbs in a year is not a lot, but there probably is a small leak that sniffer could find.
No one explained why your relay wiring worked, when you wired a RS 275-218 to a Matsu****a relay equipped board as it if were a Gruner relay board. Eh, be happy.
A 94 GTS is equipped with barrier hoses designed for R-134a - the R-134 shouldn't leak through them. 1.5 lbs in a year is not a lot, but there probably is a small leak that sniffer could find.
No one explained why your relay wiring worked, when you wired a RS 275-218 to a Matsu****a relay equipped board as it if were a Gruner relay board. Eh, be happy.
Last edited by Bill Ball; 08-17-2007 at 02:38 AM.
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Alan: After reading your primers and posts and staring at the wiring diagrams, some of it may actually be sinking in. Thanks again for being such a great resource.
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This is the kind of resource that makes Rennlist such a great value and a must have for any 928 owner.
Electronics are barely understandable by me, so I have no idea why mine worked and certainly had no idea there were differences in the Gruner and Mats relays. Sometimes its better to be lucky than good.
Anyway, glad your A/C project turned out so well. Stay cool.
Electronics are barely understandable by me, so I have no idea why mine worked and certainly had no idea there were differences in the Gruner and Mats relays. Sometimes its better to be lucky than good.
Anyway, glad your A/C project turned out so well. Stay cool.
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I've just done another Matsu****a type and realized my instructions could be misconstrued depending on how the head was oriented on the table. so, I revised post 11 to more accurately define the location of the connector holes on the head.
To recap. The wires furthest from the edge connector go to the coil pick, 7 & 8. The center wires go to the relay wiper, 5 & 6, and the wires closest to the edge connector go to N.O., 3 & 4. This is much different than the previous Gruner style, so be careful.
To recap. The wires furthest from the edge connector go to the coil pick, 7 & 8. The center wires go to the relay wiper, 5 & 6, and the wires closest to the edge connector go to N.O., 3 & 4. This is much different than the previous Gruner style, so be careful.
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another relay found
Good Evening,
I encountered a different relay when I opened my 1986 control panel. I bought the car recently and the controller may have been replaced once before - not sure. The relay has a similar part number as the Masu****a but it's an "NAIS". Any ideas where this controller relay came from ? If so, what relay mapping do I use - the Masu****a or Gruner ?
tom davies
I encountered a different relay when I opened my 1986 control panel. I bought the car recently and the controller may have been replaced once before - not sure. The relay has a similar part number as the Masu****a but it's an "NAIS". Any ideas where this controller relay came from ? If so, what relay mapping do I use - the Masu****a or Gruner ?
tom davies
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Here's a picture Tom sent me of the relay. Based on the model year, the pinout should match the Gruner, but I can't say for sure.
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Tom: Look at the underside of the circuit board. Does this relay have 8 pins coming through or just 6, like the Matsu****a (see previous posts)?
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Tom: Note that your relay has the same PN as the Matsu****a. That pretty much nails that you should use the later pinout, not the Gruner.