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Old 06-20-2009, 04:17 PM
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1978 403 olds engine

I have a 1978 trans am with a 403 olds mobile engine, its all rebuild but it keeps heating up after 30 minutes of running , it has a new radiator, new hoses, new water pump , and electric fan.
thanks for any help with this issue

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Old 06-20-2009, 06:36 PM
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shroud? you will need a closed shroud to guide all the air through the fan and radiator

is the fan big enough to sufficiently suck alot of air through the radiator ?

make sure..


thermostat ? what temp is it ? hopefully 195


is one hose hot and the other cold ?

have pressure in the hoses? can squeeze them?

or not?

is the radiator hot all over ? both tanks hot?


what temperature it getting up to max ?



need info
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Old 06-20-2009, 07:32 PM
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403 olds

I have a shroud as you can see in the picture, the fan is 16 inch in diameter, the thermostat i believe it is 195, both hoses are hot, yes there is pressure in the hoses once they are hot you can not squeeze , yes the radiator is hot all over. the electric fan kicks on at about 120 and it stays on there after, the temperature increases up to 210 and then the engine shuts off.
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Last edited by freddylv2005; 06-20-2009 at 07:42 PM.
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Old 06-20-2009, 07:38 PM
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403 olds

Quote:
Originally Posted by fast68
shroud? you will need a closed shroud to guide all the air through the fan and radiator

is the fan big enough to sufficiently suck alot of air through the radiator ?

make sure..


thermostat ? what temp is it ? hopefully 195


is one hose hot and the other cold ?

have pressure in the hoses? can squeeze them?

or not?

is the radiator hot all over ? both tanks hot?


what temperature it getting up to max ?



need info
\

I have a shroud as you can see in the picture, the fan is 16 inch in diameter, the thermostat i believe it is 195, both hoses are hot, yes there is pressure in the hoses once they are hot you can not squeeze, yes the radiator is hot all over. the electric fan kicks on at about 120 and it stays on there after, the temperature increases up to 210 and then the engine shut off.
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Old 06-20-2009, 08:02 PM
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As usual, these electric fans are not up to the task of cooling a V8 except in short duration drag usage. Put the mechanical fan and its shroud back on and you will see how much more air the mechanical fan moves. As usual 90% of the time, it is "monkey see-monkey do" misapplication of an electric fan that gets people in trouble. That fan will barely pull enough air for a 4-cylinder.
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Old 06-20-2009, 08:07 PM
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403 olds

thanks i will consider putting back the mechanical fan
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Old 06-20-2009, 08:16 PM
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Its funny how some of these websites auto parts like summit racing sale the same set up i have aluminum radiator with the same electric fan for this type of engine. are they wrong for selling this set up?

Last edited by freddylv2005; 06-20-2009 at 08:30 PM.
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