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92 suburban heater not working the radiator is full and new thermostat?
Wiki User
∙ 15y ago
The most likely cause is an 'Air Lock' in your heater matrix, probably caused when you changed the thermostat.
There are 2 ways of dealing with this;
Run the engine, with the heater temperature setting on cold, when your engine reaches normal running temperature, open the heater valve to full. This can work sometimes.
For this second method, you need the engine cold:
Remove the hose that connects from your cylinder head to your heater and raise it fully.
Pour some coolant mixture into the end of the pipe, until it flows from the pipe connection.
Reattach the pipe and secure in place.
Your heater should now work normally. If it doesn't, you may need to replace the water valve or flush the heater matrix.
Wiki User
∙ 15y ago
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