Postby busheytrader » 19 Jul 2018 17:09
Hi Phil,
I had a similar issue.
I placed the thermostatic switch in an old mug, connected a multimeter to it, then filled up the mug with boiling water. The switch should complete the circuit in a few seconds then cut the circuit as the water cools. If not it's duff. If it works and you want to be more precise on the temps, put a thermometer in the mug.
A cheap hand held infra thermometer can give a good idea if your thermostat is opening in the right ball park.
https://www.ebay.co.uk/p/Non-contact-LC ... 6effed2d70 I bought one cheap from Maplins but they went bust recently. Point it at the thermostat housing when hot water starts entering the radiator and check the reading.
Replacement switches that turn on the fan around 90c are readily available Back here in Blighty. I've read a number of articles that state they should turn on around 8 to 10c above the thermostat opening temperature (assuming that the right stat is in situ). My own turns on at 90c, the stat opens at 82c.
Hope this helps.
Adam
https://www.ebay.co.uk/itm/ELECTRIC-FAN ... SwBahVNnSx
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear Axle, 200lb Spax & PolyBushes all round, Anti- Dive, Strut-Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 14" 5 Spokes or Maestro Turbo 15" Alloys, Cruise Lights, S/S Heater Pipes, Replacement Fuel Tank. No Door Stickers. Mine since July 1986, V8 from 1990 courtesy of S&S V8 conversion kit (built not bought) and big brake kit.