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Has anyone ever seen or heard of Wynns Frostemp aftermarket AC?

Shawn

Shawn

Nuckin Futz!
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Made by Wynns back in the day, sold to another company called SCS but no longer in business. Tried both companies with no luck. Installed in a K5 in the 90s but I have no manual or diagram. Totally in the dark how these relays are wired and which wires go where. I want to replace the relays but have no relay part number or how they are wired. 5 terminals on each relay. Any idea on where to find same metal relays? I realize you can probably use newer style black box relays but not sure where the wires would go and don't want to risk frying any wires. The AC coil sits above the glove box and has a separate fan. Anyone have one installed or know anything about them? Will pay money for a copy of the install manual.

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They look similar to the blower motor relays, which may work as a substitute. It shouldn't be hard to figure out the wiring. One way is to remove the metal caps to inspect which connections are the coil, which are the contacts, NO/NC and whether or not there's a diode. Another way is with an ohm meter. The coil will be like 10's or 100's of ohms. A NO contact should read open, but the NC closed contact is kind of a mixed bag on an old relay. It could read almost anything, but if the relay is good it should look like less than an ohm.

You could also trace the wire around. One relay probably controls the clutch and the other may be for the fan. There has to be a pressure switch somewhere.
 
Blue85 said:
They look similar to the blower motor relays, which may work as a substitute. It shouldn't be hard to figure out the wiring. One way is to remove the metal caps to inspect which connections are the coil, which are the contacts, NO/NC and whether or not there's a diode. Another way is with an ohm meter. The coil will be like 10's or 100's of ohms. A NO contact should read open, but the NC closed contact is kind of a mixed bag on an old relay. It could read almost anything, but if the relay is good it should look like less than an ohm.

You could also trace the wire around. One relay probably controls the clutch and the other may be for the fan. There has to be a pressure switch somewhere.
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Thanks!!! I thought about that too. Labeling all wires where they go then take the relays apart to see what goes where. I wish they had usual relay numbers on the bottom. I was hoping for an easy-peasy replacement and swap the wires and not spend much time here but thats never the case. I got a new compressor (old one was frozen), some new universal lines and a new AC line crimper coming. Hoping to make it blow cold again... Right now my main heater/defroster fan is not even working. I can probably bypass this wire/relay mess but really would like get this working since someone had spent a good amount time and money installing this aftermarket kit.
 
Blue85 said:
How do you know the relays are bad?
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I have not verified they are bad. Nothing is working so I'm just assuming and it easy to replace IF I can find similar ones. I can take them out and test each but not sure which wire goes where without taking them apart.
 
I might have found a similar relay... Just need to test old and new to see if they operate the same.

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that relay pictured is typical high blower relay. With coil unpowered the resistor block circuit completes through terminal 2. When the coil is powered and close to terminal 3 the blower gets full battery voltage, for High.
 
Wes Harden said:
that relay pictured is typical high blower relay. With coil unpowered the resistor block circuit completes through terminal 2. When the coil is powered and close to terminal 3 the blower gets full battery voltage, for High.
Click to expand...
Great info! Thanks. When I get the new relays I'll verify. Still waiting on my universal AC lines since 2 were missing and my line crimper. Hopefully this fixes it along with new condenser and compressor
 
That's the old style of relay, like 1977 and earlier. Later squares got this one:

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Well.... I swapped the relays out and they were the same. Good news is now have the stock blower motor working again. It works on heater and defrost. There is another fan for the AC only above the glove box and that fan does not function and does not spin freely as it should. I do hear a relay clicking as I change speeds so thats a good sign. I tried to squirt some WD40 in the motor and spin which helped a little but still no worky. Its got 6 wires going to the fan motor so I need to figure which wires should be getting power just to make sure. I wish I had a schematic of this! Most likely the motor needs replaced and I'll need to drop this large honking mess of AC stuff just to get to the motor on the top Not sure what motor it even takes. Not even sure how it comes out. :dunno:
 
two direction motor wild. I would look for the correct direction motor and skip the extra cost.
 
Well... after all that with the motor and buying another blower motor, I found out it was the ground not connected to the correct place on relay. I was getting power to it but I never tested the ground like an idiot. Part of that reason is the ground wire was red I didn't want make matters worse since I wasn't sure at the time.
Red=Ground
Yellow+Blue wire connected together = clockwise
Speed Wires: Yellow=low Red=Medium Orange=High
Anyways, the old motor still works, and I don't need to remove it after all. Now get air flow on the upper vents. Pic of the dash vent motor here Looking down through the metal dash (vinyl dash not installed yet).
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Pic of the Wynns Frostemp AC unit that fits above the glove box:
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I found the top relay at the controls the ground to the dash vent blower and the bottom relay controls power to the factory heater/defroster blower motor. When I select heat or defrost, it shuts off power to the dash vent motor and turns on the factory blower. Thats how they control two blower motors with one fan control switch. Now that I figured out the wiring, I can probably move the wires and relays inside to make for a cleaner look on the firewall.
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Also replaced the compressor. Now I need to start making a few AC lines that are missing.
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New cross flow condenser also installed so I hope I can get this thing to cool once again.

I mainly wanted to post this info incase someone else runs across the same system and does a Google or CK5 search. There is zero info about these older AC systems. I did find some of these were an option installed by the dealer that originally came with no AC.
 
What turns the clutch on? In series with pressure switch?
 
Blue85 said:
What turns the clutch on? In series with pressure switch?
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It's a separate wire that shows 12v with AC on with nothing in the lines yet. I would assume the pressure switch turns this wire on or off.

The relays only control the blower motors.
 
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