Originally posted by JimBlake
How long (how many miles) on the headgasket? I don't want you to trash that...
When you drive 60mph there way more air going thru than the fan can possibly blow. Drive it to warm it up, then park it & leave it running. Maybe hold at 2500rpm or something. Just watch the temperature gauge. It might get to 1/2 or maybe a little more before the fans come on. Be prepared to turn it off if it keeps climbing, or just drive it to get air moving... Park where you can just pull out & drive? 30mph probably pushes more air than the fan.
There maybe was a 2nd fan switch, with a different setpoint, that operates after you turn the car off? My cars don't have that at all, but maybe back in '90?? Someone with a '90 will have to describe the location of the ECT sensor vs. any 2nd fan switch...
JimBlake: what's the difference between an ECT and a temp switch? I may be wrong, but in troubleshooting my fan problem I thought the manual identify both temp switches as ECTs. I'll look it up tonight, but do you have the short answer?