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Re: Oops! No Turbo Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 7 May 2007 13:19:36 In Reply to: Oops! No Turbo, diskullman, Mon, 7 May 2007 10:34:43 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I'd start with the radiator fan. Apply 12 volts from the battery to the hot side of the fan - it should run. If not, make sure the fan ground is OK. Since I'm rather timid, I'd run the wire from the battery with a 30 amp fuse in-line. Others may be more brave. If that works, I'd check into the relay. Voltage itself is not enough. The fan takes A LOT of current to start spinning. Even a small resistance in the relay contacts will limit the current and the fan won't turn. This resistance can be on the contacts of the relay, or on the tabs where the relay plugs into the socket.
I believe that the radiator thermoswitch has only one contact - the other is the body, and it grounds to the radiator. Make sure the radiator is well grounded. The grounds are just as important as the power source - any resistance will limit current. When you measure the voltage, you're probably doing it with the fan not turned on (switch not shorted to ground). So since there is no current flow, you see plenty of voltage.
I'd go after the radiator fan first, because if it doesn't work, you're in great danger of overheating. Well, the engine is; you, not so much.
The AC fan and the AC compressor run off a different relay. Yes, they have a coolant temperature switch (in a hose) that must be closed for the AC compressor to run. If the AC is commanded on, the AC RAD FAN relay should close, one set of contacts that turns on the AC fan, and also drives the coil of the AC relay that turns on the AC compressor THROUGH the coolant temperature switch. If neither is turning on, I would figure it isn't the coolant temp switch - it's at the AC Rad fan relay or what drives it. Again, a little bit of resistance can mess things up.
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