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Replacing thermostat -- drill holes?

iBran

NAXJA Forum User
Location
Minneapolis, MN
My 1994 4.0L has been running cold lately. It eventually warms up to "normal" (around 210 on the gauge), but during highway driving it hovers around 130-155. Sure, the gauge/sensor could be wonky but I'd rather be safe and just replace the thermostat.

I searched the threads here for some tips and noticed that a lot of the guys with the old RENIX (closed cooling system) 4.0s recommend drilling a hole in the thermostat to allow air to pass through. Is that necessary on my '94 with the open system? The thermostat I purchased has no such holes.
 
no u dont need hole, the hole is to help get rid of air when first installed.
 
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