OVER HEATING BADLY PLEASE HELP

[COMETGALAXIE]

hey guys its been a while since i posted anything on here sold my 65 galaxie with the 240 n got a 57 f100 with a 272 y-block but i still got the comet with the 200 in it ok so here it goes the car would over heat b4 so i flushed the everything that has to do with cooling the radiator is cleaned and i put a new water pump the fan on the water pump is a million times better then the old one the old water pump had no fan just little notches on the plate the new one i put is a small fan inside so i thought hey better for me better water flow so i started driving the car around no problem stayed at about 200 and now i dunno if its the this super hot weather but for the past month its been heating up real bad i drive from home to work about 6 minute drive about 1 mile maybe less and it starts heating up it gets up to about 220 close to 240 i know thats not normal it started happening out of no were the stock temp gauge goes almost all the way to the what can be my problem guys i put brand spanking new radiator fluid is it my radiator cap what do you guys recommend i do any help would be great thanx guys

 

[addo]

Is it possible, that you've got a blown head gasket? It doesn't always put water in the oil.

The other common cause of overheating, is retarded ignition timing. Might be worth verifying that it's about correct, by use of a timing light.

Regards, Adam.

 

[Explorer]

Had a hard time reading that all in one sentence. I could have missed it, but did you replace the thermostat and installed it correctly?

 

[714 mustang]

your cyclinders might be blocked real bad make sure the 4 bolts on the fan are no more than an 1/2 of an inch away from the rad u need the fan close to pull the air make sure ur motor mounts are tight and in good shape or u wont have a rad either

 

[JackFish]

Maybe the heater core is full of crap. Perhaps you're already bypassed it, some folks do if they have a leak.
You could bypass it and see how she runs.

 

[66 Fastback]

Have you confirmed that it is overheating? Is the stock gauge accurate?
I second the timing issue. Is it still equipped with a Load-a-matic distributor?
If you have any vacuum leaks in the vacuum line or the distributor vacuum diaprham, the timing will be retarded and will cause overheating.
If you harmonic balancer has slipped and the timing mark is not correct, when you time the ignition, it could be off and retarded.
Doug

 

[69.5Mav]

First: confirm you are overheating.

Buy a dial thermometer from your local grocery store and test it in a pot of boiling water. At 200 feet above Sea level it should read almost 212 degrees.
Next put the thermometer in the radiator and run the engine till it reaches a steady temperature and check the position of your temp. Gage. This will allow you to do a single point calibration of your gage and give a good indication of weather you are actually over heating.

If you are over heating then a few more checks are in order.

Check the coolant flow at the radiator cap while it is open. With a new water pump it should be strong and increase as you rev the engine. If not you may have a bad pump or some blockage somewhere or a radiator hose is collapsing.

Check the ignition timing. First remove the number one spark plug and insert a top dead center finder and check if the timing mark on the balancer is at top dead center when the number one piston is. If it is the use a timing light and set the timing to 6 degrees before top dead center. If not you may need to replace the balancer and then set the timing.

Lastly, check the radiator top and bottom tank temperatures at the inlet and outlet with an IR thermometer. You should have a 50 degree or more difference between them when the engine is running after warm up. If not then either the radiator itself is bad or not enough air is getting pulled through it (assuming you have enough coolant flow).