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We,re good Many Thanks Rick

This diagram that I saved has also been in my thought process from one of the S7 groups img20230813_11261905.pdf

Sorry for read. 1. is back side of radiator 2 is only port, outside of hoses and too high if air in system 3. fan plug connection, runs to light harness and back toward firewall. Easy car electrics for ref only, the sensor only talks with the ECM which controls temp gauge and should control relay I,ve wired fan BATTERY B+/ SWITCH/ FAN /BODY GROUND B- AGAIN THANKS

Here are the photos1.

Only temp sensor found, is located underneath the coil pack for engine (see pics). Was able to remove wired socket and as expected dash gauge went to high when turned on. As gauge works normally when plunged in, I'm not inclined to replace the sending unit right now. Engine and harness came from a 2011 Fiesta and tied into the caterham chassis harness. I also believe the ecm came out of the Fiesta. Thanks for all the good imput Rick img20230812_15244881.pdf

Thank you, Will start tomorrow morning. Rick

Fan never comes on, I understand that the ecm activates fan relay, but just starting that trace. Temp gauge is working, so turn on the fan manually. Central Texas heat rt. now starts at 80 degrees morning thru 115 in afternoon. Only an hour check time in morning when cooler. Still looking for sensor, no temp sending unit found near heater core or other water pathways, so far, This has a 1.6 l sigma dohc in it

All, Have positioned the sensor with chip orientation in correct position to start. Kleenex and duct tape to test for week. then more silicon.. Have read about a manual switch and wiring by pass. Any thoughts Thanks in Advance Rick Next project Radiator Fan I've put in a manual switch directly to fan so works great, but not part of system

First posting more to come All while chasing head lights not working, I removed both Ignition and lights relays. This unit also fell out of dash. chip was taped in, and siliconed in but dry so fell out. In my wisdom did not think about it. Long story short headlights work but car does not start. Switch turns on and pump primes, ck engine also registers but no starter, Checked both USA7s and Caterham & Lotus Seven Club for info. Found info on resetting but not working, suggestions