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Re: Have a 1992 chevy van 5.7 engine that runs too cool,...
Change the fan blade clutch, it might be stuck, does it sound like a airplane taking off ? if nothing else put a smaller and direct fan with no fan clutch on it
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Maybe. If the cooling system is working correctly, the only thing the thermostat does is make the engine reach normal operating temp in a short period of time. The engine is designed to run at 190 - 210 degrees as much as possible. If you leave the thermostat out, it may run cooler, but you will get a check engine light at some point in time if the engine does not reach 190 degrees within 5 or 10 min. And when the check engine light comes on the performance will drop off. And it will use more fuel.
This tip is for 210's 1.4 and 1.5. The original lowest degree temperature thermostat that manual calls for is 180 degree, but living in the southwest with a small 210 4 cyl calls for more cooling techniques. In the summer time I take out the thermostat and run it without it. In the winter time I install a regular GM 350 enginge 160 degree thermostat in my 210. It fits! And you can still run your 210 cool with 160 degrees.
No & you may not have proper control over the fuel injection Your living back in the 1950's The motor will run too cool for the computer to do it's job. Engine coolant has to be at 205 to 210 all year round & you have to have a thermostat for that to happen.
My first thought would be a vacuum leak in one of the hoses. Rubber hoses get brittle with age and even a small crack in a hose may cause surging. Happened to me in a Lumina.
You've already eliminated #3 and #6, so keep checking...
Priority Action Part Type Cause 1 Inspect Radiator Cooling System Clogged. 2 Inspect Radiator Radiator Fins Obstructed. 3 Inspect Radiator Cap Worn or Damaged Radiator Cap. 4 Inspect Radiator Fan Motor Faulty Fan Motor. 5 Inspect Belt Incorrectly Routed, Adjusted (Tensioned), Missing or Worn Drive Belt(s). 6 Inspect Thermostat Faulty Thermostat. 7 Inspect Water Pump Worn, Cracked or Leaking Water Pump. 8 Inspect Radiator Fan Relay Intermittent Failure
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