Re: exhaust manifold heat thermostat

Posted by Tim Cole On 2012/1/14 18:52:04

Dear steve:

You may be able to free the valve by soaking and lightly tapping over a period of weeks. So be patient.

You can also carefully heat the unit with a torch. I think a Mapp gas torch would be more effective than propane. You can ask the hardware store about that.

Thermostat springs are available and you can just use one from Chevy if cost is a concern.

Generally, the weight should be in the 11 O'clock position when closed. However, for the unit to work efficiently the manifold really needs to be disassembled and all the carbon removed from inside the unit. You can judge whether your unit is open by feeling the manifold during warm up. If it is getting warm above the shaft faster than below the shaft it is probably stuck closed.

If it is stuck open that is better than it being stuck closed.