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I have posted on this topic in the the past. This is a rarely mentioned area on this forum, understandable, as fewer of the cars are of the years 1994, 1995 and 1996. Freon 134a cars (introduced in 1994) use a pesky little sensor on the dicharge side of the evaporator to control refrigerant expansion and freeze up. This device sends a voltage signal to the ECU, which in turn, shuts off power to the compressor clutch magnet. The TCA is composed of a thermistor and a box housing electronic componenets. When it fails, cabin cooling is reduced and clutch cycling increased. The bad news is that to replace this part, the evaporator box has to be removed. In order to do this, a lot of interior disassembly is necessary. In addition to the TCA, the front and rear seals of the box will have to be replaced as well as the firewall seal and the refrigerant and o-rings. The link below shows a later Nissan model where diagnosis and repair are addressed. [ http://www.g20.net/forum/showthread.php?99439-For-Your-Consideration-The-Thermal-Control-Amplifier-and-EIAT-Sensor ] Every year I think of correcting this problemn in my car but never get to it. Some day... PS In some newer models the TCA can be replaced by splitting the box in situ. I wonder if an alternative process is possible for the Z32, such as leaving the old sensor in place and drilling a small hole on the box to introduce the new sensor.
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