hsbrder01

Ok i know i've seen this topic already discussed but it didn't answer my question so i thought i'd ask. My cooling fan runs regardless of temp when the key is off even if i just cycle the key. The timer is working and shuts it off after a while but while following the directions on another post they were saying unplug temp switch b so I tried and the fan kept running so I unplugged temp switch a and it kept running. So even with both unplugged the fan will run for awhile any suggestions on what to check before i start just throwing parts at it?

holmesnmanny

Since it does cut off eventually it would appear the fan timer unit is fine. I would guesstimate the relay is the culprit. Pull the relay and see if it shuts down.

hsbrder01

yeah it shuts down when you pull the relay. the relay seems to be working fine though and I tried replacing it and it still does it

tech8

1. Does your car have A/C? If you have A/C, you may have a short in the wire (Blu/Blk) before the A/C diode or after (Blu wire) the A/C diode going to the radiator fan relay; or a short in the wire (blu wire) going to the radiator fan relay from the ECU. The wire insulation may be melted or partially cut/stripped and touching body metal (ground).

2. If you do not have A/C, it may be a short in the wire (blu wire) going to the radiator fan relay from the ECU. The wire insulation may be melted or partially cut/stripped and touching body metal (ground).

hsbrder01

yes I do have a/c I'll try to look at that thank you