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Old 06-18-2007, 05:25 PM
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Default 180 in town 210+ on highway....

350 w/RV cam, new 4 core toy radiator, taurus fan.

In town fan runs and she stays at 180. out on the highway going to loveland in the 100 degree heat on sunday, she kept slowly creeping up to 210ish plus but didn't get higher than 212`213ish as I was usually pulling up to a stop in town at that point. Then in town it would cool back down.

is that too hot??? What are my options other than an aluminum radiator or different fan or?
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Old 06-18-2007, 05:34 PM
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Do you have a fan shroud installed?
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Old 06-18-2007, 05:44 PM
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what temp thermostat are you running? Mine aways run 195 with a stock radiator, no shroud, and clutch fan. My 383 was pushing 400HP. This was in SLC and Moab temps, 100+ degrees.

Do you have a high volumne water pump? That made all the difference for me.
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Old 06-18-2007, 05:52 PM
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damn.... 180 round town and 213ish on the hwy. I knew an 350 would go fast... maybe it's the rv cam
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Old 06-18-2007, 05:57 PM
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She's screamin'!!!!

I have the taurus fan so it's already shrouded. I have the stock waterpump, the long one from chevy.

The fan appears to be running on the highway as when I slow down at an intersection it's already running. I suppose I should put a light in series so I know when the fan is on.

I'm not sure of what the thermostat is,,,how's that for a good answer? I could assume, but I'd imagine it's the stock one for a 77 chevy.
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Old 06-18-2007, 06:04 PM
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I'd run a 180 degree t-stat for test purposes - but you can buy a 160 or a 195.

Isn't the Taurus fan so loud (or drawing so much current) that you can tell when it's on? If not, you might make a hot-wire switch (DPDT) for the fan so that you can manually turn it on, on the freeway, to see if that makes a difference. In one position, it runs automatically, and in the other position, it runs manually and disconnects that other circuitry (so you don't backfeed or fry something).

You might buy/borrow an IR thermometer and aim it various places on the engine to see where your heat problem might be. If it's overheating, but the lower radiator hose is cool, then you may have a flow issue (for instance).

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Old 06-18-2007, 06:04 PM
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replace the thermo with a high flow 195 degree see what happens. Then you could try a high flow water pump.

You could also try a coolant additive like "water wetter" I have not used it but have had friends see lower temps after adding it to coolant.
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Old 06-18-2007, 06:53 PM
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The thermostat is probably a 195. Take it for what it's worth but emissioned vehicles were designed to run hotter for a cleaner combustion. My Tahoe ran 210 as it's normal operating temp.

If your fan is not turning off when on the highway, it is restricting airflow to the radiator.

Make sure your radiator cap is keeping the system pressurized as well.
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Old 06-18-2007, 07:36 PM
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is it an older carbureted engine, or a newer fuel injected engine?
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Old 06-18-2007, 10:58 PM
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Quote:
Originally Posted by FJBen View Post
I'd imagine it's the stock one for a 77 chevy.
I guess the block is from a '77 so carb, probably a Q-jet.
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