Pete M

and so what's the answer?

finally found my multimeter! there are 2 power wires to the fan. Applying 12 volts direct from the batt to the one wire appears to give the same fan speed as applying 12 volts to the other wire. checking power at the plug: plug in one relay and I get 12 volts through one wire, plug in the other and I get 12 volts through the other wire. plug in both relays and I get 0 volts from anything. so it appears that plugging in the second relay is causing both relays to shut off.

be sure to add your truck to the registry

sorry for the mislabel, I misunderstood the issue. Now that I get it, I have also experienced that and I more or less had to wiggle it up and down and up and down and force it up just enough to get at the hinge with the can of pb blaster.

yup, that'll happen.

ok, so now it's doing the same thing all the time. turn key with one relay in (either one) and the fan turns on Lo. plug the other relay in and the fan bumps to Hi for a half second and then shuts down (both relays remain clicked on). interior blower and AC button position mean nothing.

how does this not have its own build thread?

more tech on the subject:

if it has the 60* chevy bolt pattern, you can get late 90s dakota L4 (or aftermarket) bellhousing and then run an AX-15

also be sure to check in on this thread:

we never left. you can load photos directly to this site. no need for hosting elsewhere. thread about popping the hood: (read all the various ideas since the problem can be different and thus different techniques might work better than others). this is not the Tech forum though, so I'll move it over there for ya.

oh what a feeling that must be!

I'm pretty sure it was a 3800 motor. maybe from a front wheel drive car? I think he's in the Epic Tech subforum.

that was good

got a couple more if anyone is interested.

tomorrow I'll take another crack at it with a cool engine and see what's going on. wouldn't shock me at all to find out there's a rubbed-bare wire somewhere. these Jeeps are know for them.

the guy replied and the lo speed is activated by engine off and AC on. this makes sense to me. AC gets low speed, engine heat gets hi speed. no idea if I'm correct, but it makes sense to me.

both relays are firing now regardless of AC or interior blower (key turned to on) and I'm assuming that's because I just got back and the engine is still warm. Individually, both relays turn on low speed. BUT, unlike earlier, now when I insert the second relay (doesn't matter which was first) the fan kick on high for a brief moment and then turns off.

I'll go run some more tests. so far I've only done: key on, engine off, AC button pushed, interior blower on.

one of the CRD guys on fb says his only fires one relay. still waiting on confirmation of which one fires.

While you're waiting for your buildsheet/birthday, you should start a build thread and share some pics

02s had drums.