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

  • Tiny
  • tnorth3
  • 1994 Mazda b4000
  • 84,000 miles

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

Friday, January 6th, 2012 AT 9:37 PM

1 Answer

  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

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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Friday, January 6th, 2012 AT 10:37 PM

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