blackedEk

So my car started overheating. I check all the things that would cause not the fan to turn on. I tested everything and tried known good working parts like the fan relay and the fan switch all good...
Last night I wanted to try to jump the connector at the thermo housing and the fan did not turn on. So my problem is that I am not receiving any connection on the fan connector on the thermo housing.
I tested the fan straight to the battery and it turned on, so fan is good and all the other components (relay,fan switch, fan motor etc..)
Where should I start troubleshooting now?

blackedEk

help me...

fcm

MM&Y of car would help. 94

blackedEk

its a 99 ex 5spd my friend.

blackedEk

I just tried to keep the fan spining thru the battery to see if the car would stop overheating and it did stop. Not receiving connection from the ECT plug

civickiller

fix one thing at a time. check fuses

fcm

Are you "checking" the ECT switch, [two wires, green and black] or the ECT sending unit, [one wire, yellow/green]?94

blackedEk

the green n black on the thermostat housing correct. Not getting any power from there..

blackedEk

all fuses are good. under hood both fuses and relays are good. I even switched a good known working relay fan from my DD, still same ****.. but like i said i think its a wiring issue, since there isn't any connection at the connector ( ect plug) where do i go from there?

fcm

The ECT switch does not have power at it, it is a grounding switch.

Start by testing the black leads at the ECT switch plug and the rad fan plug, [harness side] both should test as a grounds, full continuity to batt. neg.(-).


If the black lead is a good ground and jumping the black and green, [paper clip] does not turn on the rad fan...

Unplug the ECT switch and the rad fan, pull the rad fan relay and test the plug terminals.

With the ign. switch off there should be one terminal, [#30 or #87] that is hot, [12V+].
Turn ign. switch on to run position and there should be a second terminal that is hot, [#85 or #86], if both are good, plug the rad fan back in and use a jumper lead, [paper clip] to jump #30 and #87, does rad fan turn on?
If so, pull the rad fan relay again, install a jumper, [paper clip] on the black and green at the ECT switch plug and test for ground at the rad fan relay plug, [#85 or #86, the one that did not have power when ign. switch was on].

Recap...
1-Unplug the rad fan and ECT switch and pull the rad fan relay and test at relay plug...
2-With ign. switch off test for power, [#30 or #87] one should be hot.
3-With ign. switch on test for power, [#85 or #86] one should be hot
4-Plug rad fan in and jump #30 and #87 at rad fan relay plug, rad should run.
5-Unplug rad fan relay, install jumper at ECT switch, [green and black] and test for ground at rad fan relay plug, [#85 or #86] one should be a ground, the other hot when ign. switch is on.

Let me know what you find. 94