Where is located under hood the heater core valve??
The heater always blows lukewarm, I doubt that there is a heater core vale and it’s not opened all the way.
Sounds like ur thermostat may be stuck open. If this happends the cars coolant system can not heat up to thr proper temp, which will give u luke warm air. I would start there. Does ur temp gauge operate in the normal range, or below , if it is below the range then thats the issue
Dear Jwhalen70 The heater always blows lukewarm air (not hot) and doesn’t mutter after how much driving, however it blows not hot…. So knowing this let’s exclude about thermostat, coz if it were because of “opened stuck thermostat” so after driving so much it would willy-nilly blow hot air.
see your other post Artur
where is the rear window defroster relay location on a 94 toyota corolla?
Looking for a Used Corolla in your area?
CarGurus has 72,336 nationwide Corolla listings starting at $600.
Search Toyota Corolla Questions
Toyota Corolla Experts