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75 Cordoba Overheating

7068 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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If it was a problem with the viscous fan, the car should run cool on the highway and heat up at lower speeds. That's a good idea that's easy to test.
 

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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?
All removing the thermostat does is change when the overheating problem occurs. In my opinion, it's never a useful option.

Rather than remove the thermostat, I'd spend money on faster shipping.
 

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If it is indeed the radiator, about the only temporary thing you can do is to put the heat on full hot with the blower on high. The heater core actually functions as a small radiator.
 

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Didnt the OP say a rad shop cleaned the rad and said it was in good shape?
Yes, though there was a picture looking through the cap opening and it was still scaled up.
The OP did replace the radiator which solved the problem. The 400 in the Cordoba had a single core radiator that didn't have much margin for error.
 

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I think I would find a different radiator shop.
Heck a 318 needs a 2 row unit.
You know, the 400 may have been a 2 core? It's been years since I had one. But as soon as it started to scale up, the car wanted to run hot. I wondered if the HP 400 got a better radiator than the regular 400.
 
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