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
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
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,