Please give me your opinions:
My B2000 did this same thing last winter. Starting from cold, the coolant temp would continously rise, then when the thermostat opened a bit, it would start blowing coolant out under pressure. This turned out to be a cracked head, which I had replaced.
Now it does the same thing. I have taken the thermostat out, and even when stone cold, after running less than a minute, there is pressure in the system (confirmed by loosening of the rad cap). I am assuming it's either a blown head gasket, or another crack.
Can the root cause of this be the carburater problems this truck has had the last few years? It does not have much power (less than when I bought it 6 years ago), and will not run at high RPM under load. Would a too lean mixture cause head problems?
Thanks for any help or suggestions.
Fred