why does my temp guage flucuate and heater only work when reving around 3 k rpms

1994 MAZDA B4000
84,000 MILES
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TNORTH3
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Replaced thermostat temp sending unit and flushed coolant system. The truck reads hot when driving and heater blows cold but when u rev it to 3k rpms it drops to normal operating temp and the heater starts to blow warm again
Jan 6, 2012 at 9:37 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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