Being new to the forum I thought I would ask the following: I have a 65 coupe with a stock 289 fitted and am having trouble with overheating. I am running coolant have backwashed the radiator, replaced the hoses, new thermostat, new radiator cap 13PSI, and fitted a thermatic fan. Still no joy basically it will run okay for the first half hour and then gradually climb. It appears to increase with RPM (flex fan fitted).
For example on the weekend (40 degree day) it ran about 4/5 on the guage but as soon as I shut her off she boiled out through the radiator cap.
Dont get me wrong it has gotten better since changing all the bits but am still not happy, dont want to cook the donk!!!!!
when you say backwashed, was it pressure backflushed with compressed air aswell. Water alone will not move scale. Also the block should be backflushed aswell or else more scale will fill the radiator immediately, especially when old coolant is removed and refilled. Remove the radiator cap and lower the water level enough to look in and even feel with you fingers for any signs of scale.
Also if you dont have one a coolant recovery tank is a good addition.
If all this is done i would be looking for a possible head gasket leak... with the radiator full to the top, cap off and engine running, watch for excessive bubbles. Also check the underside of the oil cap for a milky oil film.
Firstly do you have air conditioning? If so you need at least a 3 core radiator, fan shrould, high flow fan and a small electric fan on the front to even get it close to be able to drive it in hot wheather.
Otherwise (no air conditioning) get your radiator cleaned only costs around $80 if you remove it, followed by a scale remover and thats a good starting point.
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Gents,thanks for all the assistance I had the motor and Radiator professionally cleaned out (90% blocked) gues what running cool as now. thanks again.
Its also 90% of the reason most old cars overheat, scale removing additive and then pressure flushing the radiator and the block seperately is the only way of removing the loose scale. If only the radiator is done , the scale from the block will keep blocking it up, so having that filter in there is a great idea .
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