Having problems with your 1999 Chevrolet S-10 Pickup ?

Heater won't put out hot air - 1999 Chevrolet S-10 Pickup

Posted / edited by AnonymousUser on : 21-06-2021

Answers :

Hello Pall.

There are a few things that will cause a no heat problem.

First of all, check the coolant level. If it is very low, the coolant will not flow through the heater core.

Next is the thermostat. If it sticks open the coolant will flow through the radiator all the time taking away all the heat developed in the engine.

If those check out OK, then check the two hoses that carry the coolant to the heater core.
Both should be hot to the touch and very close to the same temperature.
If one is cooler than the other there is a restriction in the heater core and it will need to be flushed out or replaced.

Next is to make sure the temperature control on the heater box is working.
This is controlled by the dial on the dash and activates a motor which moves a door in the heater box that controls hot/cold airflow. Sometimes the motors on these pickups would go open circuit and quit working.

If you would like further assistance with this problem, please ask me in a comment here.

Thank you for using FixYa.

Check coolant level.if engine is running hot could be stuck thermostat.check coolant when engine cold!worst case would be plugged heater core.u can feel hoses if 1 hot i cold heater core pluggrd
Repair Help & Product Troubleshooting for 1999 Chevrolet S-10 Pickup

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