So I pulled my '97 K1500 Suburban out of storage tonight and noticed a strange issue with the heat. It seems to cool off when I come to a stop, or when I turn the blower on high for an extended period of time. Only in the front, the rear system is operating completely normally.
Thermostat was replaced last month with a factory ACDelco 195 degree stat and seems to be functioning normally, coolant temp reads normal. No check engine light, no codes. Fluid levels are fine. No visible leaks.
Am I safe to assume that this is probably just air in the system left over from the thermostat replacement? That's my gut instinct anyway... Seems like if the water pump was going out then the rear heat output would suffer as well. And if the heater core were going, would it just magically start working again when the vehicle was under load?
Any input is welcome, I'm going to try burping the cooling system on a hill tomorrow and see if it helps. Thanks in advance everyone.
Thermostat was replaced last month with a factory ACDelco 195 degree stat and seems to be functioning normally, coolant temp reads normal. No check engine light, no codes. Fluid levels are fine. No visible leaks.
Am I safe to assume that this is probably just air in the system left over from the thermostat replacement? That's my gut instinct anyway... Seems like if the water pump was going out then the rear heat output would suffer as well. And if the heater core were going, would it just magically start working again when the vehicle was under load?
Any input is welcome, I'm going to try burping the cooling system on a hill tomorrow and see if it helps. Thanks in advance everyone.