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Air Con fan and clutch switches


Mo Murphy

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As part of my slow and laborious Air con install of a Td5 air con system into a 200 Tdi, I have happened upon the need for 2 coolant temperature switches, one to switch on the fans and one to decouple the compressor clutch when coolant temp is too high, PRC3505 and PRC3359 respectively.

As I dont have a 300 Tdi, for which a thermostat elbow with 2 tapped switch holes is available, I need to find a way of inserting them into the coolant.

Has anyone done this already ? Has anyone any suggestions on a simple method and on the best place in the coolant system to place them (I assume somewhere near the thermostat given the standard 300 location).

TIA

Mo

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prc3359 is used on both all LR Tdi engines for air con switching, you just need to find out what the thread size/type is,

prc3359 http://www.lrseries.com/shop/product/listing/9788/PRC3359-ENGINE-THERMO-SWITCH.html?search=PRC3359&page=1

prc3505 http://www.lrseries.com/shop/product/listing/9799/PRC3505-SWITCH.html?search=PRC3505&page=1

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Mo, I'm not too sure that you need either switch - in the UK anyway, one switch turns the compressor off when the coolant temp rises above 110*C to reduce load on the engine, the second turns on the A/C coolant fans when the coolant temp rises above 115*C to assist the mechanical fan and the idea is really for tropical ambient temperatures - as in well above 40*C.

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