WHY DOES MY TEMP GUAGE FLUCUATE AND HEATER ONLY WORK WHEN REVING AROUND 3 K RPMS

1994 Mazda b4000

Tiny

tnorth3

January, 6, 2012 AT 9:37 PM

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

FOUND 2271 RELATED QUESTIONS

Temp Gauge

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1 Answer

Tiny

saturntech9

January, 6, 2012 AT 10:37 PM

Sounds like the heater core is restricted I would check athat first. Unless you are low on coolant or have air in the cooling system?

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