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1994-2002 [Subscribe to Daily Digest] |
Get into the under hood fuse/relay box.
There are two relays, one for low speed, the other for high. Lid diagram should ID those.
Both the same I expect. The high speed bypasses the resistor.
Does the fan run all the time in high or low speed?
You can pull the relays to find out which. I would swap the relays to see if one seems to be 'on all the time'. You can have one installed at a time. The relays can be opened up if one seems bad. Perhaps a 'welded contact'. Sometimes relays can be fixed.
Best to use a meter to check to see if pins 30 and 87 are connected when the relay is removed. That should be normally an open circuit. Go buy a digital multi meter if need be.
If the fan runs when you pull the relays, the problem is in the wiring between the fan and the relay terminals (87).
If no relay problem. Pin 86 on the relay connect to the ICE module which grounds those pins to activate the relay coils. Measure ohms on these pins to ground. Should be open circuits or very high ohms. If low or zero ohms, there is a problem. If also like that when ignition is off for a few minutes thats another clue. ICE is the source. Get radio code handy and remove batter -ve terminal for a few minutes, reconnect and start over. Might be a logic glitch. If problem persists, ICE might be bad, or engine temperature sensor or ECU is telling the ICE that the engine is hot. Does the engine temp indicator read low with a cold engine?
Fan is are on when engine started, but not when ignition on and engine not running?
Note that AC will turn fan on low speed, turn ACC to econo or off.
Another easier way: When playing with the relays under condtions where the fan wants to run, you can feel the relay as you seat it. If you feel its coil click in as you make contact, the ICE terminal is providing a ground to pin 86. But you might still feel that even if the contacts are welded. If no clicking in either socket, then the ICE would seem to not be the case, but that should make the fan run with the ignition off and the only way to stop would be to then discon the battery. The power to the relays is on all of the time -unswitched power-, on pins (30)&(4).
A problem with the AC pressure switch could also force the ICE to activate the low speed fan. Inspect wires to switch at dryer behind the grill. See a connector? After other causes are investigate, try disonnecting that connector, but again, turing off the AC should stop the fan even if the pressure switch or wires are not right... but perhaps not.
If the problem seems to be between the relays and the fan. IE, relays do not seem to be activated when seated, or fan runs with no relays, open up the relay box and look under the relay board. And signs of wires overheated and melted through insulation to cross connect? If that were to occur, fans could never be off if cross connected to unswitched power, but could be if cross connected to switched power. If fan wires cross connected to ground, fuses would blow. If wires to ICE-(86) cross connected to ground, that would turn on fan. If these were cross connected to +12VDC, that would do nothing at all.
posted by 68.93.19...
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