Still trying to trace down fault,,Blower motor works Resistor seems to be testing fine ,,,BUT on the fan speed,NOTHING works.1-5 NADA,,I have an extra speed/ac/direction assembly & switched it out & nothing.
IF I could find a working resistor for the 93/940 it seems to be about$90 delivered,Which I dont want to pay on the chance that it would solve the problem.
I can get a a resistor assembly from an 80s chevy for $18 at Autozone..Has anyone tried to modify their 940 this way??

Came up with this post from tb that includes a nice pic. Fuse seems to be rated for 280 deg, but do a little more research. I saw a thermal fuse on eBay for $1.

http://forums.turbobricks.com/showthread.php?t=324477&highlight=Blower+resistor+fuse

Marty

Ok I'll if the local electric supply might carry those fuses,,the fact that there is a simple fuse ,[this splains a lot LUCY!!]& the idea of trying the cheapest fixes `1 st.

IM GOING TO JUMP THE THERMAL FUSE & SEE IF IT WORKS ,,

IF NOT ILL ASSUME ITS THE AC SWITCH ON THE MCC,,I FOUND LOADS OF PARTSCARS HEREhttp://car-part.com/cgi-bin/search.cgi

I jumped the thermal fuse & got no response..I tried all the fuses & they seem to be OK,,Ive been only working haphazardly because luckily the heat dissipated..& ive been doing other things,,Ill try & see if by pulling on the harness I disconnected a wire.The harness is short & I had to pull on it switch out the mcc controls..
Also I got a new 850 resister that only has a fitting for the double plug so I plugged that in & got nothing also,,I wouldve thought maybe 2-3 speeds at least..

My suspicion is on the fan speed switch. Check this switch. Firstly connect back the old fan resistor and fan motor. Ignition key to KPII.

Pull out the AC control box out of the dashboard. There are two electrical connectors for the fan switch. Pull them off. One connector with 2 wires, another connector with 5 wires.

Start with the connector having only two wires (red/white and black wires). The black wire is the one supplying power to the switch. Jump both wires on same connector. The fan should spin and simulate full fan speed (no.5).

Next jump the black wire with any wire on the other connector having 5 wires. This should simulate other fan speeds (no.1 to no.4)

This should indirectly confirms the fan switch as defective (direct confirmation should be testing the switch itself)

Hope this helps,
Amarin.

Thanks Ill check that out,,I wondering if the fact that the heater /ac control doesnt CLICK in any position an indication of it wearing out??

If no fan at any speed, check fuse #16 for blown or signs of overheating - melted fuse plastic and its slot. The fuse carries heavy current to the fan. If this happens you might need to splice in an external fuse as the melted slot have misaligned contacts that poorly conducts any current (which leads to more overheating and melting). Long term solution is to find good used fuse cluster and replace the entire cluster as in FAQ.

If only fan speed no.5 works then the fault is at the soldered thermal fuse of fan resistor assembly. The fuse looks like a small shiny tube about 1cm in length. You could jump this fuse for a while (use alligator clips or twist some short wire on it) to see if things start to work again.

The fan switch itself (speed 1-5) rarely fails at all speed. Other speeds could still be working. No clicking however could mean broken/worn contact swipe arm within the switch. You could test this switch using multimeter or dismantle to see its inside. Need to take out the AC control cluster to gain access to this.

Hope this helps,
Amarin.

Check that resistor assembly. I believe there is a thermal fuse in the assembly which if blown does not allow the resistor to work. When Radio Shack was still in business I picked up a new fuse and installed it for $2.

Gluck

Marty

Dear Oleseahorse,

Hope you're well. Do you recall the fuse rating and type?

Yours faithfully,

Spook

Hmmmm. Looking all over the place on the net garnered me some level of knowledge. At this time I can only guess at 20v 180 deg. My presumption is the fuse exceeds it's capacity on real hot weather with the blower on only possible 1. At that speed, the resistor doesn't receive enough cooling.

I bet there's some info on the, or other sites.

Marty

Thanks Ill check this out,,,It was a HOT day when it stopped working!!!

Check that resistor assembly. I believe there is a thermal fuse in the assembly which if blown does not allow the resistor to work. When Radio Shack was still in business I picked up a new fuse and installed it for $2.

Gluck

Marty

Do you have a 1 wire or 2 wire blower motor? Are you getting 12v down to and out of the resistor(high setting).
--
Post Back. That's whats makes this forum work.

2 wire motor,,plug,I cut off plug & now use spade connectors to ensure good fit,,Now Ill dig a little deeper,,

I;ll check the resistor next chance I get,,just ordered an 850 resistor,,&ill check & see if I can jury rig it,,it was only $8.50!!Where as IF I could find a new 1 its $90..