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

Some things to check:
Test the thermostat to see that it opens at 185
Check the timing and mechanical and vacuum advance
What is your gas mileage? If it is below 20 MPG something is bad.
Brakes dragging, engine not right, etc.
Is anything blocking the air intake to the radiator like a license plate?
Is your coolant 50/50 soft water and permanant type anti-freeze?
Pressure test your radiator cap.
Is there a spring inside your suction hose feeding the water pump? If
it's missing the hose could be kinking under high speeds and high flow
rates. Is there any debris caught between the radiator and the
condensor coil blocking air? Could the vee belt be slipping on the
water pump?
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, Joe Angell <jangell@...> wrote:
> 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.
> Thanks!
> -- Joe


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