Why would a 66 Impala 396 run 200F on the freeway but overheat in traffic with 4 core rad shroud 7 blade fan?
First off, is the cooling system all stock as it came from the factory? I have a 427 version completely stock with the 4 row as you describe. I had same problem until I did the following.
The cars cooling system was NOT by design set up for a coolant recovery or plastic can attachment. The upper portion of the upper radiator can was for the needed space in the cooling system for expansion. If your filling the system 100% full when it opens the thermosat it is too full and will puke out the coolant mix. Leave it about 3/4 full (upper tank) when the thermostat is open and coolant is visably flowing with the cap off. Make sure your cap is good to 18 lbs.
2nd. the fan clutch from the trucks for that year will work wonders for you in keeping temps down. I live in Yuma AZ. where summer temps reach 117 plus and stays there most of the mid summer days. My big block with 4 speed and all stock 4 row cooling system and a truck heavy duty fan clutch behind the stock fan and a 160 thermostat lets me run about 165 to 170 on the interstate all day long here and it will climb to about 195 sometimes towards, but not to 200 at a long city stoplight. Never been over 205 since it was returned to stone stock and a truck fan clutch and 160 stat.
GM had it right for these cars back then and it still works today. I had a twin electric fans set up on it for a while it would not stay below 200 on the best day out. The wife of the owner of the oldest radiator shop here in town saved me many headaches when she told me how to do the above and added, never add the catch recovery can system and get rid of the electric fans on it at the time.
Sometimes, the old guys and gals still have it. !!
Does it hurt the engine? Yes and no. It won't hurt to run the engine for a while. But running without a fan shroud seriously reduces the efficiency of the cooling system. Consider the shroud on a rad as a type of straw. Without it you won't suck much air through the rad. At slower speeds this will probably end up as an overheat situation. If the vehicle came with one, use it.
dougs answer Hi It is a very bad idea to remove your fan shroud. You will overheat at some point. The reason is that the shroud is custom designed to funnel air across your radiator and transmission oil cooler. Every fan needs a tunnel to push air or you just have a ceiling fan that blows air everywhere but where it is needed.If it is broke and rubbing, then replace it. That's the only reason…
check the easy things first. 1. bad radiator cap or no coolant 2. bad hoses 3. leaks in radiator 4. check thermostat (usually good to change this anyway) if problem is not corrected by these: 5. check fan clutch if applicable ( my jeep is an 86), the fan should run constantly 6. lastly the water pump. pay attention to when it tries to overheat. 8. if it only heats up when your stopped, something…
Why would someone weave a shroud for a person that is not dead but assumed dead like Penelope weaving a shroud for her father in law there is no body?
Why would a Chevy silverado 2500 HD 4 wheel drive overheat while pulling a trailer up a hill you have replaced the thermostat and had the cooling system flushed?
No - it's a stained bit of cloth, thought to be a shroud. (that's cloth wrapped around a dead body). ----------- Scientists have studied the shroud using X-ray flourescence and infrared thermography, as well as sponging the shroud with 25 different solvents, without finding any evidence of paints or pigments. Other scientists said they have found pigments on the shroud. (I guess the only way to know which scientists to believe is to study the…
The Shroud of Turin is a linen cloth bearing stains in the image of a man who underwent physical trauma consistent with crucifixion. Some people believe that the shroud was the shroud placed over Jesus Christ's body after the Crucifixion, and that it is his body that the Shroud bears the image of, but that debate is ongoing.
The shroud is held in place by 4 clips. There are 4 openings on the sides of the shroud - one for each clip. Two of the hole are round and 2 are rectangular.. One at a time, insert a small screw driver or similar tool of these openings and push to release each of the clips. Once the clips are released, the shroud will lift off. If you force the shroud off without releasing…