There are a few things you can do;
Make sure the heat is set all the way to HOT.
Look for a bleed screw, near thermostat housing or highest point in cooling system, and open it and close it when only a full and steady stream of fluid comes out. DO NOT OPEN IT WHEN SYSTEM IS HOT. OPEN IT WHEN YOU FIRST START THE ENGINE. YOU CAN OPEN IT JUST A BIT TO START, BUT REMEMBER, THIS IS HOT AND UNDER PRESSURE.
Simply keeping the engine running can help to bleed the coolant system. Fill it until the thermostat opens.
Here is a link for bleeding fluid systems. Bleeding cooling systems is the second paragraph.
Here is the link;
https://www.2carpros.com/articles/vehicle-bubbling-noise
Let me know if this information helped.
You might get an infra red thermostat as they are under $ 20 now and the thermostat should open at 176-183 degrees farenhiet.
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Tuesday, October 11th, 2011 AT 6:44 PM