[DML] Running hot when it's hot out
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[DML] Running hot when it's hot out

Here's a mystery I've had for some time now:  When it's hot out, my  
car runs hot.  It's fine most of the time, but once it gets above ~70  
degrees out, the car starts to run hotter than it should.

For example, if it's ~80 degrees out, the car might run at 220 or so  
when moving at highway speeds (~3000 RPMs or so, I'd guess; whatever  
70 MPH comes out to in 3rd on an automatic).  When ~100 degrees out,  
it gets up t 240, the first redline on the temp gauge.  It will drop  
back down a bit once I get off the highway, but not down to the  
acceptable range.

I checked for coolant leaks and found none.  The coolant bottle was  
about 1/2 full, as it should be.  I bled the system at the radiator  
and water pump and found no air at all.  I replaced the thermostat  
about a year ago, but this made no difference.  The water pump is  
about 5 years old, which is when I had an engine overhaul done.  The  
radiator is one of the new triple-core brass ones, also 5 years old.   
The cooling fans are running fine, and go on at the proper temperature.

Any suggestions on what I should check next?  It's rather  
infuriating.  I was thinking of bringing it to a radiator shop and  
having them purge the system, but I'm not sure if that would help.


-- Joe


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