possible bad heater control valve?
An S10 is the same as a Chevy S10.
The Chevy s10 was introduced in 1982.
A bad engine temp sensor can do that.
Check your heater core and thermostat. The thermostat may be stuck open. Does the S10 run hot or cold?
Yes
999.99
Will a Chevy blazer engine fit in a Chevy s10 pickup
there is no thermosat on a 1944 Chevy s10. For that matter there is no 1944 Chevy S10
Yes they are the same
Sure, in an emergency but, you will have poor heat and the check engine light will illuminate.
It is located under the AC and Heat instrument panel
I have always used 10w30. never had any problems.