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Re: Radiator Fan stopped working - Ari, Quasi ........HELP! Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 6 May 2003 12:13:15 In Reply to: Radiator Fan stopped working - Ari, Quasi ........HELP!, Sreeni, Tue, 6 May 2003 10:41:23 Members do not see ads below this line. - Help Keep This Site Online - Signup |
LesH is definately on to something.
Blowing a 30 amp fuse isn't small potatoes. One of two things - either a nice, hard short to ground, or as LesH says, a problem with the low speed circuit. Perhaps there is a problem with the switch you bought (new parts sometimes do fail) - perhaps you wired it backwards, so the High speed kicks on first. Or that the low speed circuit just isn't working.
With the car cool, see if the fuse blows. If the fuse blows when the car is cool, you've got a wiring problem - most likely a nice, hard short to ground. Next, start the car. I would expect the fuse to blow sometime after the car warmed up a bit, and when the needle started to climb.
The fan switch triggers on radiator temp, which is a different temp than what the dashboard temperature gauge shows (engine temp). But after the engine has warmed up, they'll be somewhat close. If the fuse blows when the needle drifts up to around 10 - 10:30 on the gauge - before the red, then I'll bet you've wired it backwards, and the high speed circuit is kicking in first. If it goes up to the red before blowing, then the low speed circuit is probably open.
Why does speed cause the fuse to blow?
It takes a lot of current to get a fan going fast. Normally, the low speed circuit kicks in first, getting the fan running slowly. This doesn't take a lot of current. When (and if) the high speed is required, the fan is already running, and it doesn't take a lot of current to speed up.
Think of it this way - suppose you hooked a tow truck up to your front bumper. If you just pop the clutch on the tow truck and take off full speed, you'll rip the bumper off. If you start out gently, all should be fine. The low speed fan coming on first is that gentle start.
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