tjwalsh

Help, My heater blower only works on high speed. I'm pretty sure that the problem is in the blower resistor relay module. I have seen in other postings that the module has been located near the blower motor but on my van the wire from the motor seems to run off to a wiring harness that runs through the fire wall.
I can't find it under the dash or don't know what it looks like if I did find it.
Anyone know where to look on a 95 Astro, what it looks like (size, color) and maybe a part number ?
Thanks, Tom

drew300

You've looked behind the window washer / rad overflow bottles? Mines' (97) there, about 5 or 6" x 1 or so.
If yours isn't there, it's got to be in the blower motor airstream, usually in the blower box.

tjwalsh

Thanks Drew300,
It was in the blower box. The cable plugs into a panel at the top of the blower box. The panel comes out with two screws and the resistor assembly is on the underside of the panel. I tested the components on the assembly and found that one of the thermal fuses had blown. When I jumped across the fuse the fan worked properly. Chevy wants $41 for the new assembly which I should probably replace so I have the thermal protection but I'd rather just replace the thermal fuse if I only knew what size to get. Does any one know what the rating on the thermal fuse is? Mine is too corroded to tell.

Tom

drew300

You've said resistors, and thermo-fuse. I guess you know the difference. I didn't see a thermofuse on my board. I had a printed wire corroded away by the sealant GM used. I replaced the printed wire with a soldered in one. A thermo fuse? What's the purpose? Does it protect the blower motor? I thought you'd want to keep airflow if the box got hot. That said, the thermo fuses I've seen are color coded (at one end) for the temp rating. I've bought a few at Radio Shack, or a local electronics part store. I fold up the leads, and carefully heat-sink the lead with pliers before soldering. don't cut the lead, soldering will melt the new fuse.

fishman490

how do you take driver door apart for power window switch access?

sreve

start a new post.you won't get much response on a hvac thread.