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'[TECH] Mazda Miata overheats'
2011\06\15@223657 by YES NOPE9

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gradually overheats on long drive
no coolant is missing
fan belt is quiet ... does not appear to be slipping
turning on interior heater with fan brings temp down
( i have only seen water pumps fail by leaking and screeching )

What might it be ?   How can I test ?
99guspuppe

2011\06\16@000302 by John Ferrell

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On 6/15/2011 10:36 PM, YES NOPE9 wrote:
> gradually overheats on long drive
> no coolant is missing
> fan belt is quiet ... does not appear to be slipping
> turning on interior heater with fan brings temp down
> ( i have only seen water pumps fail by leaking and screeching )
>
> What might it be ?   How can I test ?
> 99guspuppet
It needs the CORRECT thermostat installed. I have witnessed the situation where a late 1980's Chevrolet overheated with the thermostat removed and worked ok with a new thermostat installed. The mechanic said the water needed to go slower through the radiator. I never understood the situation but it did work...

More personal experience: Burned exhaust valves lead to running richer which then leads to fuel still burning in the exhaust manifold. Just more heat than the system can handle. Check compression...

--
*John Ferrell W8CCW*

**//**

"In peace, sons bury their fathers. In war, fathers bury their sons."

- Herodotus, Greek historian, 5th century B.C.**

**

2011\06\16@105609 by Herbert Graf

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On Wed, 2011-06-15 at 20:36 -0600, YES NOPE9 wrote:
> gradually overheats on long drive
> no coolant is missing
> fan belt is quiet ... does not appear to be slipping
> turning on interior heater with fan brings temp down
> ( i have only seen water pumps fail by leaking and screeching )
>
> What might it be ?   How can I test ?
> 99guspuppet

The fact that turning on the heater solves the issues points to the
radiator part of the "loop". Your radiator might be clogged, either
internally, or externally. It could also be piping/hoses going to the
rad.

If it looks good on the outside, dry draining the rad (most have a drain
plug near the bottom, otherwise just remove the bottom hose) and having
a look with a flashlight to see if there is an abnormal amount of
deposits in it.

TTYL

2011\06\16@113040 by Bob Blick

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You've probably seen this, most everybody with a Miata knows about this
site. In case you haven't, this is their cooling system page:

http://www.miata.net/garage/CoolingSystemProblems.html

Bob

On Wed, 15 Jun 2011 20:36 -0600, "YES NOPE9" wrote:
> gradually overheats on long drive
> no coolant is missing
> fan belt is quiet ... does not appear to be slipping
> turning on interior heater with fan brings temp down
> ( i have only seen water pumps fail by leaking and screeching )
>
> What might it be ?   How can I test ?
> 99guspuppet

-- http://www.fastmail.fm - Email service worth paying for. Try it for free


'[TECH] Mazda Miata overheats'
2011\08\07@142358 by YES NOPE9
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Update

I offer thanks to Bob Blick and others who offered suggestions.
After replacing the thermostat ( the old one looked fine ) ..... the engine ran hot one time after that change.   It has never overheated again.  I have no explanation for this.

99guspuppet

2011\08\07@150410 by Carl Denk

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2 thoughts:
1: The thermostat can look good when cold, but the test is, stick it in a pot of water (kitchen stove) and heat it. Before the water boils, it should be open say 1/4" roughly.
2: Modern engines can air lock, where a bubble of air gets trapped in the system, and there is no or little circulation as a result. Each vehicle has it's own way to clear the situation. Sometimes it's loosen a certain hose end. And remember when refilling to turn the heater temperature to hot and usually the recommend turning the fan on high.

On 8/7/2011 2:23 PM, YES NOPE9 wrote:
> Update
>
> I offer thanks to Bob Blick and others who offered suggestions.
> After replacing the thermostat ( the old one looked fine ) ..... the engine ran hot one time after that change.   It has never overheated again.  I have no explanation for this.
>
> 99guspuppet
>
>
>
>

2011\08\07@165959 by Bob Blick

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I'm glad you found miata.net to be a good resource. They have some
amazing tidbits of info about the cooling system in Miatas.

Cheerful regards,

Bob

On Sun, 07 Aug 2011 12:23 -0600, "YES NOPE9" wrote:
> Update
> > I offer thanks to Bob Blick and others who offered suggestions.
> After replacing the thermostat ( the old one looked fine ) ..... the
> engine ran hot one time after that change.   It has never overheated
> again.  I have no explanation for this.


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