Can A Two-Pin Coolant Temperature Switch Handle Full Auxiliary Fan Power Through It? - Page 3 - PeachParts Mercedes-Benz Forum

Diseasel300 · #31 05-08-2018, 10:28 AM

Quote:

Originally Posted by tangofox007

The only thing incorrect here is your understanding of the subject system. The temperature switch is precisely that.

Not familiar with the 116, I wasn't aware that the old cars used a Klixon style switch. The 126+ use a pressure switch for the "temperature" switch. They're threaded into the receiver/dryer and have a hole that communicates with the refrigerant directly.

ROLLGUY · #32 05-08-2018, 11:32 AM

Quote:

Originally Posted by Diseasel300

Not familiar with the 116, I wasn't aware that the old cars used a Klixon style switch. The 126+ use a pressure switch for the "temperature" switch. They're threaded into the receiver/dryer and have a hole that communicates with the refrigerant directly.

You are correct in that the temperature switch is directly in contact wit refrigerant (as explained in post #26), but it is not a pressure switch. It senses temperature directly, not indirectly like a W123. The temperature and pressure switches do not do the same job. One senses pressure, the other senses temperature, even though they are both under pressure.

Squiggle Dog · #33 05-08-2018, 07:14 PM

Well, I may just leave the auxiliary fan circuit alone. Since I am going to still be using refrigerant R-12, I will have increased system performance anyway since I upgraded to a parallel-flow condenser, and a more powerful auxiliary fan. When the receiver drier temperature switch causes the auxiliary fan to come on, it will do the job faster than stock.