heater temp fluctuates

[fireftr]

:fire: Just got back from a trip in my '92 and noticed the heater temp wouldn't stay set. My wife kept playing with the blower switch, either full high, or off. Needless to say, the trip wasn't much fun - trying to constantly adjust for comfort. She thinks the temp should be adjusted with the blower speed. Anyhow, has anyone experienced this, and what did you find?

 

[Jason_25]

What was your engine temp during this time? If it was out of whack as well, it could be your thermostat sticking open.

 

[Alec]

could be the thermostat, or the heater control valve. However, some amount of blower and temp variation is normal. For instance, my heat will get warmer with engine temp and will also blow more as rpms go up. So when I floor it on the highway with the heat on I get toasted!