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The cranking position of the ignition switch works through the neutral safety switch before the starter itself . The AC when on will automatically run the cooling fans . During cranking they should be out or off for the starter to receive it's high current draw .
There are two different thermostats--one in the cooling system, and one just to turn on fans. The AC has a separate circuit to turn on fans regardless of engine temp, so tind the the fan thermostat and test it.
There is an electric fan that should come on with the AC and run whenever the AC is on,if it doesn't come on it will heat up very quickly. Sounds like a problem with that radiator mounted fan. The fan is supposed to come on when the engine gets hot enough also. If so, the AC should be ok at hiway speeds.But you need the fan to work.
Check if you have electric fans for the radiator as it may be them going in the run position. If the ac is left switched on then when in the run position of the ignition key the fan for the ac condensor may be starting up
Most overheating problems are caused by a stuck closed thermostat, if it has already been replaced the next common cause is a clogged radiator, have it checked at a REAPIR SHOP OR RADIATOR SHOP IF YOU REMOVE IT YOURSELF
Do you have the AC in on position from previous time when turned off. ?
AC will turn both fans on by default. Try turn AC off, also be sure defrost/defog is NOT on, as this will activate AC also. Now turn off ignition. Turn back on. Still doing it? If both fans still come on with ignition, then it may be a stuck relay but, you need someone more knowlegable than me to help with that
temperature switch bad goto dealer parts get diagram(they give free)find switch remove plug to switch (turn ignition key to on position)take short piece of wire jump plug wires see if fan starts if not check fan motors for operation if they do switch bad replace you can get better deal at local parts house than dealer on switch try that see if thats whats doing it!!!!Best Of Luck toYou!!!!
Doesn't take a technical engineer to find what could be the problem ! Looking a wiring diagram I see three relays that are used to turn on the cooling fans ! One of the relay's contacts are stuck closed causing Battery voltage to be applied to one of the fans when you turn the key to the on position . Your best bet , take it to a qualified repair shop .
The fan relay may be malfunctioning (the fan relay is what actually switches the fan on and off and gets its signal from the ECM, which in turn gets its signal from the temp sensor) testing/replacing the relay and temp sensor would be the best thing to start with,... unless you notice any additional (non factory) wire attached to the power wires to the fan. Sometimes folks, in an attmpt to fix an overheating or fan relay problem, attach a ignition switched positive lead from the fusebox or other switched source to the positive poer lead on the fan,.. making the fan run whenever the ignition is switched on.
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