Toyota - The recall KING?
- Thread starter buster
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One of the things I noticed about the Saab 93 is that the engine cooling fan can, and sometimes does, continue to run after the engine has been shut off. (My first car, a 1986 Dodge Omni, also did the same thing, but I figured that was just because they were too cheap to add a relay to cut power to the fan when the key was turned off).
I'm pretty sure, on the Saab, this is to help cool the turbo (which is water-cooled), but I wonder if a Toyota were modified to allow the engine cooling fan to run for, say, a minute after shutdown, if it would help prevent oil coking in the cylinder head.
I'm pretty sure, on the Saab, this is to help cool the turbo (which is water-cooled), but I wonder if a Toyota were modified to allow the engine cooling fan to run for, say, a minute after shutdown, if it would help prevent oil coking in the cylinder head.
JHZR2
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IIRC, the 9-3 is oil and water cooled for the turbo... that said, I assume this means that there is also an electrically-driven water pump, or is it just flow induced by thermal gradients?
One way or another, heat soak is prevalent on all engines from what Ive seen, at least when theyre driven at fullt emperature for a long time then sht down too soon. It seems that it would be an easy system to implement on all cars that have electric fans, etc., i.e. all FWD type cars, I suppose.
JMH
One way or another, heat soak is prevalent on all engines from what Ive seen, at least when theyre driven at fullt emperature for a long time then sht down too soon. It seems that it would be an easy system to implement on all cars that have electric fans, etc., i.e. all FWD type cars, I suppose.
JMH
No electric waterpump, just "thermosiphon".
I did notice that the Chevrolet Malibu Classic with the 2.2L Ecotec (actually the only engine it ever came with) also has the capability of keeping the engine cooling fan running after shutdown, but it only does this at a higher engine temperature than when the Saab would keep the fan on. IIRC on the Malibu it was something like 240F, but the manual may have been wrong. I don't honestly know what sort of conditions a vehicle would need to be driven in to get the coolant temperature that high with a properly functioning cooling system--I have never, ever seen my Contour get over about 215F.
I did notice that the Chevrolet Malibu Classic with the 2.2L Ecotec (actually the only engine it ever came with) also has the capability of keeping the engine cooling fan running after shutdown, but it only does this at a higher engine temperature than when the Saab would keep the fan on. IIRC on the Malibu it was something like 240F, but the manual may have been wrong. I don't honestly know what sort of conditions a vehicle would need to be driven in to get the coolant temperature that high with a properly functioning cooling system--I have never, ever seen my Contour get over about 215F.
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