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International Automotive Technicians Network
Re: Poor heater performance (aftermarket coolant problem?)
Posted to HVAC Forum on 9/2/2017

Tyrell

What is the engine operating temp viewed on a scanner ?

Are the engine cooling fams coming on

Possible causes of low or no heat

1) low engine temp - bad/incorrect thermostat - low fulid level 2) Low fluid flow - Bad water pump - restricted radia... Login to read more.