What is the best way to connect an automatic fan switch onto a 700R4 trans? What temp should it turn on and off? Is there one that works best?
Presumably you'd have to install a temperature controlled switch in the port for a temp gauge that turns on around 200' or so. Doublecheck that, there are sources on what the correct op temp for a trans should be.
Normal transmission range is between 180F- 250F with pan temperature @ 60mph being 180F. Any more that 20mins @300F and you could need some repairs. When towing a load the temp can easily rise to 250F. 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mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} </style> <![endif]-->Based on advice I received the consensus is to run transmission coolers in a series, from pressure outlet of transmission through radiator first and then through an auxiliary cooler before going back to transmission. Firstly, the reasons for this is that if the transmission fluid is hot, it will be cooled more quickly and efficiently by the radiator. Secondly, if it is cool it will be warmed up and yes they can run too cool. When they run cool condensation that may be in the system remains there, NOT GOOD. The transmission needs heat for self preservation but not too much. If the fluid is too hot after it leaves the radiator it will be cooled by the auxiliary cooler before going back to the transmission. Auxiliary coolers needs to be mounted where airflow isn't impeded as it needs to dissipate or radiate the heat, air flowing through and over does the job. If stuck for space a small slimline auxiliary coolers with a fan is the go. In colder areas and on short trips, the transmission may not get hot enough to reach optimum operating temperature. By being routed through radiator firstly it will be heated to a better temperature. I checked my late model in the garage and this is the way the big manufacturers now do it.
What if the radiator does not have ports for the trans lines and what if the cooler is nowhere near the radiator, but gets pleanty of air? On my COE the cooler is mounted in front of the engine, between the frame rails and under the bed. It is 6 feet back from the radiator. There is no preheat system. Also no fan at this point.
I got a Derale PN 13021 thermal fan switch from Summit. Goes inline next to your cooler. And then got a small SPAL fan mounted on the cooler. Don't know how well it all works yet, but the setup looks really nice.
I have beendrivingmy dads truck with a 200r and from exprerience you want he transmission to be running warmer if you want it to shift into overdrive at a lower speed. You don't want it 250 but you also. Don't want it 160 either
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