I have a 92 S10 with the 4.3. I recently took the temp control module out to clean the connections on the wires. They get real hot when using the medium fan setting and melt it or glaze over the connections. I cleaned those and the fan works again.
At the same time I pressure washed the under side and top of the motor to clean off the mess from when the radiator was leaking which has since been fixed,.
Now I do not have any heat or vent. They justmake a hissing sound and comes out the defrost. If I turn it to Bi-level for ac it works, but when I give it a lot of gas it roll sback to the defrost then when I let up it goes back to bi-level.
I've checked every single host under the hood and all are hooked up and no cracks. The hiss is from inside the dash.
Did Ipull ahose lose inside somewhere? I followed all that I can and cannot see that they are lose. If I turn it to vent or heat the motor idles down back to where it should be,
Any ideas?
Lannie