I don't know of a way to get it working without getting it up to temp. Could use a multi meter to check the circuit. As long as no shorts in system, and ect is sending right temp signal to ecu, then if should work. I would start by running am ohm resistance check on circuit. Set your multimeter to ohm and the 200 setting. Then touch one lead to the black wire on fan relay, and other lead to the right fan switch connector and see if have a low resistance reading, should be around .8 that will show if you have a good circuit. If don't you will have to start working your way backwards testing the circuit. Right fan switch to left fan switch, if that's good, then left fan switch to blue connector where front and rear harness plugs in. If have good circuit from left fan switch to front part of blue connector, then go from back half of blue connector (which is rear harness) to fan relay in tail. If don't have any shorts or breaks in any wires, then can remove ect and test it according to manual. That's what I had to do, ended up having a bunch of broken wires in rear harness.