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Old 03-25-2008, 03:12 AM   #1
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Default Coolant temp too low.

So, my coolant system is stock with the exception of the begi coolant reroute. However, coolant never gets to operating temperature. It will get to about 140*F but thats about as high as it will go. I thought maybe the thermostat was stuck open so i replaced that to no avail.

I know i have a lot of problems. I really do search first! It seems like i have some really strange problems. Just tell me if i ask too many questions and i will exhaust some other sources first.

Thanks so much!
-Wes
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Old 03-25-2008, 07:55 AM   #2
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maybe its a good thing?

faulty gauge?, try trouble shooting with another gauge
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Old 03-25-2008, 09:29 AM   #3
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Begi's reroute shouldn't cause that. Get an OEM Thermostat in there.
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Old 03-25-2008, 10:09 AM   #4
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What T-stat did you use? Whats the ambient temp up there? This morning it is 55* here and my coolant temps didnt go above 180*.
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Old 03-25-2008, 10:19 AM   #5
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at what temp is the PNP set to turn on the fans at?
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Old 03-25-2008, 10:42 AM   #6
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While driving, my coolant temps range betwen 195-200* at all times. I have the OEM automatic radiator and both the plastic-radiator-shroud in the nose removed and the engine undertray removed. I run 100% Prestone green/orange universal stuff.
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Old 03-25-2008, 10:44 AM   #7
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the reroute alone should not cause that...
are you certain the MS is not reading wrong values? i had that problem, turn out to be a missing resistor...did you have MS in there before reroute and had normal temps, if so then its not your MS...
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Old 03-25-2008, 10:45 AM   #8
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I would definately check the thermostat in the housing. How is the heat in the car? Is it operational? If I were to venture a wild guess, it would be that your thermostat is stuck open.
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Old 03-25-2008, 11:02 AM   #9
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Before i have had normal temps with the mspnp before. I replaced the thermostat with what autozone said was oem temp. It said 82*C on it. I just took an hour drive and the car did finally reach operating temperature but it took at least 25 minutes. The temperature outside is low 40's i think. There was frost on my car when i went out this morning.
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Old 03-25-2008, 11:44 AM   #10
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I would go to the Mazda dealership and pick up a thermostat from them.
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Old 03-25-2008, 11:47 AM   #11
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your reading your temps correctly...the BEGi reroute and/or water bypass will certainly take it longer for you to get up to temps.
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Old 03-25-2008, 11:58 AM   #12
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Quote:
Originally Posted by Braineack View Post
your reading your temps correctly...the BEGi reroute and/or water bypass will certainly take it longer for you to get up to temps.
Okay, thank you. Also, is it normal for the temperature to drop significantly when coasting down a long hill?
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Old 03-25-2008, 12:02 PM   #13
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Yes, since your coasting, the water flow in the engine is slower. This will cause the water in the radiator to get nice and cool and as soon as you bring the revs back up, you move all the nice cool water from the radiator back to the motor. I used to see this happen all the time on my NA with the 55mm KOYO on cool days.
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Old 03-25-2008, 12:07 PM   #14
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Yeah, it is normal that it takes longer to reach operating temp, however 25 minutes does seem a bit extreme. What fluid is in the radiator?
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Old 03-25-2008, 12:14 PM   #15
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I have green Prestone 50/50
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Old 03-25-2008, 12:16 PM   #16
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Quote:
Originally Posted by Doppelgänger View Post
Yes, since your coasting, the water flow in the engine is slower. This will cause the water in the radiator to get nice and cool and as soon as you bring the revs back up, you move all the nice cool water from the radiator back to the motor. I used to see this happen all the time on my NA with the 55mm KOYO on cool days.
Sounds good, im just really worried about little things. I guess i dont trust my own work. I drive down the road and i cant help but think about coolant hoses blowing off or oil fittings leaking or my brake fluid reservoir melting.
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Old 03-25-2008, 01:13 PM   #17
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ill tell you what, we can swap motors/cooling systems because i overheat on the track all the time, but around town and autox never overheats!
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Old 03-25-2008, 04:10 PM   #18
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Quote:
Originally Posted by Doppelgänger View Post
Yes, since your coasting, the water flow in the engine is slower. This will cause the water in the radiator to get nice and cool and as soon as you bring the revs back up, you move all the nice cool water from the radiator back to the motor. I used to see this happen all the time on my NA with the 55mm KOYO on cool days.
Olderguy? Any comments about thermodynamics?
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Old 03-25-2008, 06:25 PM   #19
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Quote:
Originally Posted by paul View Post
Olderguy? Any comments about thermodynamics?
If we are talking the Begi reroute that takes the outlet from the heater core and moves it to the bottom radiator hose, there should be no difference.

If we are talking about a newer reroute, I haven't thought it out and would like to see the final resulting diagrams.

Essentially, if you are allowing more of your coolant to get to the radiator that is not being restricted by the thermostat(as in Paul's set-up), it will take longer to come to operating temperature, especially with a larger radiator.

In a standard set-up, and in the referenced first Begi reroute, no water flow is present in the radiator until the thermostat cracks open.

The OEM thermostat is a 2 stage unit that allows a small amount of water to circulate at a little lower temperature before the main opens, thereby keeping a large volume of cold water from suddenly hitting the motor from the cooled radiator..
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Old 03-25-2008, 06:28 PM   #20
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i just wanted you to comment on the speed of the water through the radiator and the effect this would have on cooling the motor.
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