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post #1 of (permalink) Old 02-22-2002, 09:30 PM Thread Starter
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More On Operating Temps ??

A couple of questions regarding operating temperatures....

Here's what I have:

195 thermostat
new water pump
rad just cleaned and tested by radiator shop
electric fan with sensor in the upper rad tank & adjustable thermostat

How is it that when starting from stone cold, the motor will warm up to 210, then drop down to 180, then stay there, even while driving? I would think it would run around the thermostat rating.

I believe the adjustable thermostat for the fan is defective and I'm waiting for Flex-a-Lite to send another one. Currently I need to have it set at 230 so that it doesn't run all the time on the highway despite the fact that both my gauges say I'm running at 180.

I;m sure there is something I'm missing (concept block), but my cooling system doesn't seem to be acting normal even though there isn't any overheating.

Any ideas?

Oh, this is on my 1.6, Weber & Thorley...... Thanks!



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post #2 of (permalink) Old 02-22-2002, 10:24 PM
 
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Re: More On Operating Temps ??

Your thermostat is probably going bad. The temp will fluctuate a little but should stay at or above the thermostat temp. 210 is normal for a 195 stat, 180 is a little on the cool side.
Here's exactly what's happing from my point of view:
The thermostat's not closing all the way, and water is leaking through it. Since you have an electric fan, the lack of airflow allows it to warm to normal temp when sitting still.
Once you get up to highway speeds, you don't need a fan anymore, there is enough airflow to cool the engine. Since the thermostat's not closing all the way (asuming that's what the problem is), the engine is quickly overcooled.

I think I'd start by changing the thermostat. The stat for you fan could be bad also, I guess, but that would cause the problem you describe. There should be no water flowing through the radiator until you reach 195, so, even if the fan were running all the time, the engine should still maintain proper temp (like it did in it's stock state with the engine driven fan).
Hope this helps. [img]/wwwthreads_images/icons/tongue.gif[/img]

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post #3 of (permalink) Old 02-22-2002, 10:26 PM
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Re: More On Operating Temps ??

Good luck. Any decent cooling system in a Zuk will act funny since the engine and head are aluminum and don't want to run hot. On top of that, there isn't enough capacity to keep the temp up where it should be. Mine either wants to run 170*, or 205*. Just can't seem to get it in the middle. You may want to try a higher pressure cap, more system pressure will allow it to generate more heat to a point, but makes it easier to control. You shouldn't have to run the fan control at 230*, something is definitely wrong there.
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post #4 of (permalink) Old 02-23-2002, 02:06 PM Thread Starter
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Re: More On Operating Temps ??

Well, I just replaced the stat and the rad cap. On the highway, ambient outside temp about 40 degrees, I'm running about 175-180 degrees. Around town, I'm running about 185.
The stat I've been using is a Super Stat that apparently has "V" notches that provides a small initial flow, and reduce cycling by metering the amount of coolant needed. This might have some effect on my "cool" running.
The fan stat is definitely defective and I'm waiting for a new one from Flex-a-Lite. I've adjusted the fan stat so it doesn't start up while on the highway.
I suppose this is just the way it wants to be and will probably stay this way till warm weather hits and I'll go to a 180 stat. Thanks guys!

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post #5 of (permalink) Old 02-23-2002, 02:08 PM Thread Starter
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Re: More On Operating Temps ??

I still haven't a clue why when I close the heater valve, that my temp gauge will read cooler. It just doesn't make sense to me.... Maybe it never will.....

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post #6 of (permalink) Old 02-23-2002, 06:40 PM
 
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Re: More On Operating Temps ??

How do you all know what the temp. is my temp gauge just has lines on it. I put a 190 degree stat on it and it likes to run fairly close to what I guess is the upper end of normal line on the temp. gauge. I know if you run straight water it will run cooler than with just antifreeze/coolant. If it's not running bad though why mess with it my guess would be in the summer your cooling system will have a harder time keeping up with the high temps.


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