chevyaddict
Well-known member
Hi all;
I remember when I was searching the forums for this information I didn't find anything quite this detailed so I'm only putting this up for that very reason. This was a couple steps deeper in information which is what I like! I like to understand more deeply. Anyhow, I thought that someone might could use this at some point in the future!!
The fans are powered via llines running from a junction block located behind the battery. One line runs from the battery to the block to provide a 12V source. There are about 10 or so lines running from the block to various parts of the vehicle to supply power. The lines are protected with fusible links (short pieces of wire that burn up at a specific current rating...they look like wire but act like a fuse).
Two of these run forward to power the cooling fans, with power switched via relays on the left side of the radiator housing.
The easiest check is to see if there is power to the fan. First, pull the connectors to the fan relays and check pin E for 12 v. This pin is connected to the junction block thru the fusible link. If there is no power, inspect the wires at the junction block and you'll probably see one of the fusible links burned up.
If there is power, try jumping pin E to A. This bypasses the relay and puts the 12 v to the motor. If the motor does not operate normally, (turns slowly, etc.) then it is probably the problem. Often as one of these motors goes thru its death throes, it takes the fusible link with it, so be careful.
If it's the fusible link, you can get some at any auto parts store. The rating is marked on the link. But if its the link, it probably burned up because either the motor is fried or something was preventing it from turning.
I remember when I was searching the forums for this information I didn't find anything quite this detailed so I'm only putting this up for that very reason. This was a couple steps deeper in information which is what I like! I like to understand more deeply. Anyhow, I thought that someone might could use this at some point in the future!!
The fans are powered via llines running from a junction block located behind the battery. One line runs from the battery to the block to provide a 12V source. There are about 10 or so lines running from the block to various parts of the vehicle to supply power. The lines are protected with fusible links (short pieces of wire that burn up at a specific current rating...they look like wire but act like a fuse).
Two of these run forward to power the cooling fans, with power switched via relays on the left side of the radiator housing.
The easiest check is to see if there is power to the fan. First, pull the connectors to the fan relays and check pin E for 12 v. This pin is connected to the junction block thru the fusible link. If there is no power, inspect the wires at the junction block and you'll probably see one of the fusible links burned up.
If there is power, try jumping pin E to A. This bypasses the relay and puts the 12 v to the motor. If the motor does not operate normally, (turns slowly, etc.) then it is probably the problem. Often as one of these motors goes thru its death throes, it takes the fusible link with it, so be careful.
If it's the fusible link, you can get some at any auto parts store. The rating is marked on the link. But if its the link, it probably burned up because either the motor is fried or something was preventing it from turning.
