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75 Cordoba Overheating

7030 Views 39 Replies 10 Participants Last post by  valiant67
Hey all, I've had a 75 Cordoba for a while now and have battled overheating issues the last several years. I've replaced the water pump, radiator hoses, thermostat (and boiled to check, it's working), had heater core redone and cleaned, had radiator repaired and cleaned (told it's in very good shape by reputable radiator shop), did the paper test to check fan (it pulled very tightly on radiator), replaced intake manifold gaskets, two different new radiator caps, timing is dialed in to proper spec (both mechanical and vac advance), air/fuel seems to be good, done full block and radiator flush kit (did get a lot of crap out of it), have OE shroud and good OE fan on it, and have ensured all air is out of the system, extensively burping any and all air out of it... I'm basically at a loss of what to do. I can drive the car 5-10 miles before the temp gauge gets to over half, and if I turn around and go home that far, I am pegged out on a warm day. Thermometer to intake/radiator shows upwards of 250-260 coolant temp when pegged so I know the gauge is correct, though I rarely let it get that high. Even blasting full heat (hotter than the surface of the sun) the car will still overheat. The car runs great aside from the overheating, I'd love to take it on longer trips but am unable to due to the issue. I've covered all the things I can think of that would cause the overheating, but the issue persists. Any ideas would be greatly appreciated. Thanks, Tyler.
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Could also be scale built up in the block, especially if it has drain plugs for coolant that have never been used.
Had a slant-6 that had never had the block drain open, had to hammer a nail through the scale under the plug to get it to flow. Then the coolant came out like chocolate.
 

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You're getting VERY little flow through those tubes. Time for a new radiator.
 
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Do you think to get me by until the new one comes I could pull the thermostat to help it flow more through, or would that just make the problem worse from moving coolant too quickly through the engine, not so much the radiator?
Removing the thermostat will not improve the bottleneck at the radiator, and will make the car run richer as it will take longer to warm up.
 

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And if you splice the trans cooling lines with rubber hose, be sure to buy special oil-resistant hose for the purpose, with fuel injection band clamps. Otherwise, in about 3-5 years, that hose will disintegrate, and your transmission will run dry.
 
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