Car running hot ó is it the Evans coolant? - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 113 (permalink) Old 06-08-2019, 04:50 AM
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Most of the Alfas driven in Italy, back in the day, were run with just water. Water without any antifreeze is going to boil at 212 degrees F. Coolant with a 50-50 mixture not only keeps the water from freezing, but it raises the boiling point about 10 degrees F.

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post #17 of 113 (permalink) Old 06-08-2019, 05:43 AM
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The radiator was flow tested, are there any cool spots (checking with the infrared sensor?) I typically have the rad core boiled out then flow tested.

The older I get.. the faster I was....
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post #18 of 113 (permalink) Old 06-08-2019, 07:13 AM
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Cognitive dissonance
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post #19 of 113 (permalink) Old 06-08-2019, 11:27 AM Thread Starter
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I rechecked all the under-hood temps with an IR thermometer after a 40-mile run.

The rad is 210 at the top and 165 at the bottom. The bottom hose is also 165.

Even after 20 minutes above 70 mph the temperature gauge still does not get below ~195. Outside air temperature is 75F. Nothing is blocking airflow to the rad.

The fan is new and electric and is working.

I did not have anything done to the radiator, but it is the same radiator that always kept the car cooler than 185 previously. I did run water through it from the garden hose before reassembly, and it seemed to flow water well.

Do the symptoms above point more to a bad radiator or incorrect thermostat? Is it even possible to have an incorrect thermostat that fits perfectly?

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post #20 of 113 (permalink) Old 06-08-2019, 11:35 AM
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Your new electric fan.... did it always have an electric fan or did you swap out the mechanical one? Is it operating at top efficiency? Does I think have a shroud to direct air flow? Thermostats do come in different temp ranges but with the Alfas I don't know. Have you just removed the T-stat and ran it open? Keep plugging, you'll find the issue sooner or later...
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post #21 of 113 (permalink) Old 06-08-2019, 11:46 AM Thread Starter
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Your new electric fan.... did it always have an electric fan or did you swap out the mechanical one? Is it operating at top efficiency? Does I think have a shroud to direct air flow? Thermostats do come in different temp ranges but with the Alfas I don't know. Have you just removed the T-stat and ran it open? Keep plugging, you'll find the issue sooner or later...
I had the mechanical fan before. The switch to electric fan came with the other recent changes.

Shroud is as pictured.

I havenít just removed the thermostat and run it open. Should I try that?
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post #22 of 113 (permalink) Old 06-08-2019, 11:49 AM Thread Starter
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Hereís the thermostat
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post #23 of 113 (permalink) Old 06-08-2019, 11:57 AM
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I would first question the efficiency of the new fan. You can surely remove the thermostat and see what the temps do. Should take longer to come to temp and may not even get to optimal temperature without it. At what temp does the fan come on? Is the T-stat new too? You ca. Test a T-stat in a pot of water on the stove if you have a thermometer to watch the temp when the T-stat opens.
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post #24 of 113 (permalink) Old 06-08-2019, 12:15 PM Thread Starter
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I would first question the efficiency of the new fan. You can surely remove the thermostat and see what the temps do. Should take longer to come to temp and may not even get to optimal temperature without it. At what temp does the fan come on? Is the T-stat new too? You ca. Test a T-stat in a pot of water on the stove if you have a thermometer to watch the temp when the T-stat opens.
The fan is from Centerline and seems to be moving plenty of air to me. Is there anything I can do to test its efficiency? My mechanical fan was down to two blades, so Iím not sure it was doing much anyways. And a 70 mph freeway breeze doesnít bring the temps down to their previous levels either, so I donít think the fan is to blame.

The fan comes on around 190F and is activated by an inline thermo switch provided by Alfaholics and installed in the bottom hose as per their instructions.

I tested the thermostat in water before installing it. It opened, but I didnít note the temp. Itís the ďEuro 1750/2000Ē item from Centerline.

I was under the impression that with the thermostat removed half the water or more would go down the bypass hose, making an overheating situation worse rather than better. Is that not correct?

Could I have a thermostat that is not properly blocking the bypass hose?

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post #25 of 113 (permalink) Old 06-08-2019, 12:21 PM
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If you are moving at 50 mph or above then it should not overheat with no fan. You should only need the fan when you are in slow traffic or stationary.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #26 of 113 (permalink) Old 06-08-2019, 12:39 PM
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Time to do some debugging and less talking 🙂

If you have the old themostat, put it back and test.

If no change, remove electric fan and test.

A lot of posters have suggested things but we are not getting the results 🙂

Best
Pete
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post #27 of 113 (permalink) Old 06-08-2019, 12:54 PM Thread Starter
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Time to do some debugging and less talking 🙂

If you have the old themostat, put it back and test.

If no change, remove electric fan and test.

A lot of posters have suggested things but we are not getting the results 🙂

Best
Pete
Thanks Pete. Unfortunately I don’t have the old thermostat.

When you say remove the electric fan, do you mean to replace it with a mechanical fan or to run with no fan at all?

It’s Saturday afternoon and I don’t have anything better to do. I will get straight to work as soon as I have some clarity on what I should do. But I don’t have a good, old thermostat or mechanical fan.

I could try running on the highway with no fan at all. If the temps stay low, that’d tell us the problem is the electric fan is doing more harm than good.

What should I try first?

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post #28 of 113 (permalink) Old 06-08-2019, 12:55 PM
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Oh, I forgot about the big grille on the front of the spiders forcing air through the rad at 4K rpm on the highway.... you'll find the issue sooner or later!
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post #29 of 113 (permalink) Old 06-08-2019, 01:30 PM
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Run with no fan just to see.

It is possible that at speed the fan is acting like a wall of air.

But if you have the old fan, I'd chuck it back on.

Only way to find out what's happening is to try things until something gives you a hint, and then you will find the real solution 🙂
Pete

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post #30 of 113 (permalink) Old 06-08-2019, 01:31 PM
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Is the fan running in the right direction? Reversing the wiring reverses the direction.

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