I need some help. I just got back my 92 ssrx efi turbo diesel surf from the shop, after replacing the engine. The original had a blown head and I replaced the head and rings but it still smoked a lot, I then replaced the entire engine with a used one. The problem is that the fan in front of the radiator is not running. I think it works with the engine temperature, but it still does not come on. There are also fans mounted under the engine, to the front and these are running. There are 3 relays, 2 in a compartment and 1 together with the other relays and fuses. I removed the grill and checked the fan by running a direct power line and it works, could it be the relay? And if it is, which one?

 

I don't think many people here can help since almost nobody here in north america has a diesel, but maybe...

It sounds like it could be a relay or the temperature sensor. Maybe the wires didn't get hooked up when the engine was swapped?