Hello, on a 1991 Chevy pickup, 4.3 engine, does anyone know if the thermostat spring faces up or down?? It has reverse flow water pump. Thanks, Tim
- posted
15 years ago
Chevy 4.3 thermostat replacement
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- posted
15 years ago
Down. As a rule the heat slug gets installed facing the engine. Regardless of where it's mounted. That way as the engine temperature rises it will open. Install it backwards and you will probably overheat long before it opens.
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15 years ago
I just did this on my 99 Blazer. Spring is down like every one I've ever seen.
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- posted
15 years ago
Yep, easy thing to remember on a thermostat. The spring and control go in the water flow coming from the engine. Otherwise they wouldn't operate.