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Mustang Technical Discussion > Pre 1973 > replacing ac > Community Forums > Mustang Forum Australia - Mustang Tech

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123abc
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MY vintage air kit is due to arrive any day now so I managed to get a copy of the instuctions in it it says to substitute the binary safety switch to a trinary switch if using thermo fans ,my question is can I just put a small fan on the front of the condenser so it comes on when the aircon is used or do I need to put at trinary switch in


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hybrid
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It should be fine to have a fan that engages along with the compressor.


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lukep6470
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yes I just switching on the regular thermo fan with the AC is all you need. Make sure the condenser is as close to the radiator as possible.


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123abc
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I do have a big fg fan behind the rad as per my other thread (overheating at lights) so yeah it will only need to keep temp down till the other one comes on or car is moving


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hybrid
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You could just have the AC turn on the big fan if it's not already on.
Chances are on a day you're wanting the aircon instead of having the window open, you will probably need the cooling fan too.


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123abc
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the big fan is on a thermo control so im hoping a little one should do in between cutting in and out


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ozbilt
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123abc wrote
the big fan is on a thermo control so im hoping a little one should do in between cutting in and out


What the boys are saying is by having the big fan also triggered by the A/C clutch, is the fan would be drawing air through the rad long before the temps rise. Having a fan cut in after it is hot (thermo controlled) can be too late on a hot day to bring it back to the normal range.


Kerry

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lukep6470
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Yes don't bother with an AC fan, just have the big fan come on with the compressor. Just a wire from the compressor relay to the fan relay.

I was looking at putting in an AC fan and the AC place that did the lines said don't bother and showed how the condenser temp dropped dramatically with just the big fan.


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123abc
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hybrid im running the same fan as you, if I wire in the compressor to the slow speed port to be on when the compressors on will it short if the high speed fan is triggered by the rad thermo switch


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