Quote:
Originally posted by rcmktg
It is, indeed the thermal switch for vacuum advance in a CIS system. It allows vacuum to the distributor during cold start and into warmup.
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Richard, are you sure about this. On my 89 it is called a thermovaccum switch and is connected to the intake under the airflow sensor and the other tube connects to the EGR gizmo on the fenderwell. My EZL vacuum line connects directly to the intake manifold.