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Old 08-02-2012, 03:15 PM   #1
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Default Bros, why is my daily overheating?

The car is running hot in traffic, hotter of course when the AC is on...it was 109*f outside yesterday. My CEL flashes at 220*, the radiator boils water occasionally, but the temp-strip on the top of the rad says it's never been over 220*f.

  • The water pump is 2-years old
  • I have a CX racing radiator
  • Murray 1.3BAR radiator cap
  • Fans are sealed with tape to the radiator (temporary)
  • 180* old thermostat checks out okay, a new one is in there anyway

If I can make it to September with this ----, I will live.
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Old 08-02-2012, 03:19 PM   #2
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reroute?
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Old 08-02-2012, 03:20 PM   #3
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Quote:
Originally Posted by gospeed81 View Post
reroute?
Negative. A stock Miata should be able to handle this heat. It did in previous years.

I suspect that I could be losing water possibly, the calibration could be off on the sensor, or I sabotage.
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Old 08-02-2012, 03:25 PM   #4
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Are the fans coming on?

If they aren't coming on: Disconnect the fan and wire it directly to a battery. If it spins it's the relay, if it doesn't it's the fan itself. Twice I've had a relay to the fan die, and replaced it at a junkyard for $1. Tons of cars use the same relay.

If the fans and thermostat are working it's most likely a waterpump or headgasket.

Edit: Is this a 1.6? Could be the "Cursed Water Plug"
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Old 08-02-2012, 03:26 PM   #5
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Fans?

Obstruction?
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Old 08-02-2012, 03:28 PM   #6
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Our '92 overheated...a lot. The first answer was a big PWR radiator. I later did the reroute and ran a stock automatic radiator and kept the same temps.

Sounds like you've got something else compounding the problem.
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Old 08-02-2012, 03:37 PM   #7
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Fans come on and feel strong. Condenser and radiator are fairly clean.
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Old 08-02-2012, 03:38 PM   #8
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When stock cars overheat, they are broken.

Check in this order:
-Low coolant level
-Lack of OEM ducting/shrouding
-Leaks (invisible ones)
-Leaks (big -----off ones)
-Radiator obstruction
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Old 08-02-2012, 03:57 PM   #9
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When you are sitting at your apartment can you get it to overheat just sitting there? IE does the fan turn on and then not cool it down enough to turn back off?
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Old 08-02-2012, 03:58 PM   #10
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Radiator fluids fresh? What kind of mix are you running?
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Old 08-02-2012, 04:47 PM   #11
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Air bubble? Give it a bleed maybe...
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Old 08-02-2012, 05:25 PM   #12
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Quote:
Originally Posted by shuiend View Post
When you are sitting at your estate can you get it to overheat just sitting there? IE does the fan turn on and then not cool it down enough to turn back off?
With the AC on, yes.
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Old 08-02-2012, 05:25 PM   #13
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Air bubble? Give it a bleed maybe...
I used magical funnel, was fairly certain of no air.
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Old 08-02-2012, 05:26 PM   #14
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Radiator fluids fresh? What kind of mix are you running?
Just a couple cups of anti-freeze, the rest is distilled water.
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Old 08-02-2012, 05:27 PM   #15
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Quote:
Originally Posted by Savington View Post
When stock cars overheat, they are broken.

Check in this order:
-Low coolant level
-Lack of OEM ducting/shrouding
-Leaks (invisible ones)
-Leaks (big -----off ones)
-Radiator obstruction
Coolant is full
OEM stuff is there.
There could be a phantom leak, but pressure tester says no until the rad cap leaks.
I can see through both the rad and condensor.

All this makes me think the water pump is either not effectively moving water, or there is a leak.
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Old 08-02-2012, 05:29 PM   #16
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Radiator says (according to "temp-strip") less than 120, but CEL flashes at 120, means the block is hotter than the radiator. I think that points to circulation:

Blockage - foreign matter or air pocket
Pump not working as it should

Check the flow.
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Old 08-02-2012, 05:32 PM   #17
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Also, radiator will transfer more heat to the atmosphere if you run a 195į thermostat. Assuming there is water flow of course.
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Old 08-02-2012, 05:58 PM   #18
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Quote:
Originally Posted by rleete View Post
Radiator says (according to "temp-strip") less than 120, but CEL flashes at 120, means the block is hotter than the radiator. I think that points to circulation:

Blockage - foreign matter or air pocket
Pump not working as it should

Check the flow.
220*f
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Old 08-02-2012, 05:59 PM   #19
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Quote:
Originally Posted by rleete View Post
Radiator says (according to "temp-strip") less than 120, but CEL flashes at 120, means the block is hotter than the radiator. I think that points to circulation:

Blockage - foreign matter or air pocket
Pump not working as it should

Check the flow.
I dumped some dye in there today, I guess I'll go look for the leak when I get home.
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Old 08-02-2012, 06:24 PM   #20
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Stat sticking closed due to used condom?
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