El Camino Central Forum banner

1 - 1 of 1 Posts

·
Super Moderator
Joined
·
4,363 Posts
Discussion Starter #1 (Edited)
<TABLE width="98%" align=center bgColor=#ffffff border=0><TBODY><TR><TD><TABLE width="82%" border=0><TBODY><TR><TD vAlign=top align=left width="21%">

Click for full size image​


</TD><TD vAlign=top align=left width="3%"></TD><TD vAlign=top align=left width="76%">Most common problem I have found is a burned or corroded electrical connector in the high-blower motor circuit. After time, the brushes in the blower motor will wear down, causing the motor to draw excessive current, (amperage.) The higher current causes heat, thus the melted connector. Look for a black, four pin connector (C516) in the engine bay, passenger side firewall. Usually, you will find the red (S247) wire in the connector burned.</TD></TR><TR><TD vAlign=top align=left width="21%">


Click for full size image​


</TD><TD vAlign=top align=left width="3%"></TD><TD vAlign=top align=left width="76%">Snip the wire on each side of the connector (C516) and splice back together using an inline fuse holder or circuit breaker, (20 amp fuse or breaker.) And since we know that the blower motor is on it's last leg, you should replace it. Of course, this isn't always the problem, you could also have a bad switch on the control panel, a bad high-blower relay, related wiring, or a loose or weak ground circuit.</TD></TR><TR><TD vAlign=top align=left width="21%">


Click for full size image​


</TD><TD vAlign=top align=left width="3%"></TD><TD vAlign=top align=left width="76%">Using a test light or voltmeter, you can easily diagnose the problem yourself. Assuming you have already checked the connector, turn the key on, blower switch on "high," verify voltage at pin "D" on high blower relay, (S546.) If no voltage present, the problem is either an open circuit between the relay and the fan switch on the control panel, or a defective fan switch. If you do have voltage at relay pin "D," check for voltage at pin "A" of the relay, if no voltage, check for a bad ground, if the ground is intact, replace relay.</TD></TR></TBODY></TABLE>


</TD></TR></TBODY></TABLE>​
 
1 - 1 of 1 Posts
Top