I'm looking for a location to mount a thermal fan switch. I may install an electric cooling fan in the future. But at the moment, I'm thinking about using a fan switch to power a warning light to let me know if I'm running too hot. So I need a location to mount a switch and I'll need the correct switch to make it work. There are a couple of possible locations to mount a switch. I'm posting a link to an 87 22r which appears to be identical to my 86. https://www.yotatech.com/forums/f116...sensor-264307/ In the first photo near the green coolant sensor, there is a plug bolt...M16x1.5? If so, I could use a Toyota style of thermal switch, maybe one used on a Camry. In the second photo, there is a horizontally mounted plug/bolt. It is near the white, round connector with the brown wire. This one looks interesting, I'm not sure of the size on it...M18x1.5? Some of the Hondas use M18x1.5 fan switches.

 

For the e-fan you want it mounted to the rad or rad hose. So the fan is not running all the time.

But there may be other option I haven't seen. Mine also has a threaded plug on T-stat housing but have heard down side if you run an adapter to use NPT style sensor.

LCE has a slick hose adapter I plan to install.

 

is you use a hose use that is the outlet from the Engine.. or directly to the block..

I had a fan switch bolted in place of a coolant plug.

I would think this would be the best place to get the temps from.

 

I don't know which coolant plug you are referring too. But you want the sensor in top hose or as close to upper radiator inlet as possible.

 

You can mount fan switches in different places in the cooling system. Some Auto Manufacturers mount them near the thermostat (hot side), some mount them on the bottom of the radiator (cool side). The important thing is to balance the system by using the right temperatures on your stat and fan switch. If your switch is on the hot side, you want a temperature buffer between when your stat starts opening and your make and break temps on your fan switch. If you have a good buffer, you will avoid problems. In one application, I'm running a 180 stat with a fan switch that makes at 198F. If I changed to 195 stat, I could have problems... the fan would start running way before the stat is fully open. I'm looking at some fan switches for use on Honda Accords (88-94) and Preludes (93-2000). These switches are of the probe style and Honda mounts them near the thermostat. These are M16x1.5 switches, and I still need to determine if the top plug on my 22R is the same thread. I found there are some available that make at 198F and also some that make at 220F (single speed switches). Drawing is for a 91 Accord.

 

Cool, the t-stat housing is a nice place to put in. I'd seen homebrewed hose type and liked the lce plus i was already ordering something from them.

I do like the hot side better than cool. Here's my thought on why. I used to run the trails in PNW man man at low speeds with RPMs up to 2000 to 3000 the engine compartment would get hot. I want the coolant cooled and ready to go into engine rather than waiting for radiator to get hot and triggering fan when bottom hose is cool. Plus heat rises.

But this is also the way I've had it set up so may be biased.