Quote:
Originally Posted by AdamIsAdam
Short story: replaced restrictive electric fan with Extreme Duty Hayden mechanical fan, spring modified, 18.5" blade fan. NEVER runs over 180* at low speeds or idle. No shroud necessary.
Plus 10* vacuum advance using modified unit ... ...It opens with 4-6" of vacuum.
I'm good.
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Good, not great.
A shroud on the fan would make it far more efficient, which means you wouldn't need the "extreme-duty" fan clutch with a modified spring--or the horsepower to drive it.
The Heavy- and Severe-duty fan clutches are not suitable for use with typical automotive fans, (Less than 2 1/2" of pitch) because they'll never properly disengage. Hayden says as much on their web site.
http://www.haydenauto.com/Featured%2...s/Content.aspx
How much engine vacuum do you have at highway cruising speed?
Quote:
Originally Posted by geeteeohguy
160 'stats in all my Pontiacs for the past 39 years. I live in California, so don't need a furnace for a heater in the winter time. No reason to run a 180-195 'stat where I am......my cars run at 180--210 all the time anyway.
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That's all the evidence I need to know that either your cooling system doesn't have the heat-rejection capacity it should, or there's problems with excess heat generation.
210 is 40 degrees over the nominal 'stat temperature. The 'stat lost control of the temperature at 20 degrees over. The cooling system is running wide-open and has zero capacity for additional load.