Question about 2005 Mazda RX-8

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Coolant light comes on briefly then goes off. I added coolant but the next day the light did it again.

I don't see any coolant leaking and it doesn't look low. I can add a little bit of coolant the next day but not much.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Mazda MPV Coolant Loss (but no overheat)

i had the same thing on my wifes 2000 mpv van...the ends of the radiator are made of some sort of composite type material....it had a slight crack in it....wasn't obvious until it got worse and started streaming water from it when warmed up....even after it cooled enough not to be spewing it was hard to actually see the crack though a few inches long....was hard to even see where the water and antifreeze mixture was coming from until i took out the radiator

Posted on Jan 13, 2009

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SOURCE: overheating. stop the car checked coolant, which

Sounds like you have a blown head gasket.

Posted on Aug 22, 2009

Testimonial: "that's we thought and hoped it would be and not a cracked head."

  • 10 Answers

SOURCE: Coolant light

If you locate the water expansion tank (front of the bonnet, opened, with the pressure-cap to top-up if necessary) - check that there's sufficient coolant in there (check whilst the engine is cold).

If so, you may be suffering the same problem as a lot of RX8 owners, with a dodgy coolant level sensor in the tank. One way to confirm this is to remove the connector to the tank - on the left-hand side of the tank as you look from the front (not the air-conditioning connector, immediately to the left of it, attached to an aluminium billet). Ensure the (now free-hanging) connector from the wiring loom is safely stowed and give it a test drive. If you're satisified that the warning goes away then you know that the level sensor in the tank is faulty (and therefore the warning light is spurious). Unfortunately, that's a pricey item to replace (dealer price, UK, in the region of £200).

Remember, leaving the coolant sensor unplugged to avoid the spurious warnings would mean that a genuine problem that resulted in (catestrophic) loss of coolant would then go undetected, until too late. So do this at your peril.

Posted on Sep 10, 2009

aocomp
  • 56 Answers

SOURCE: How do I know if my Power steering unit(?) has to be replaced

no power steering fluid would cause the pump to overheat, damaging seals.
the foam might have been pump cavitation causing injestion of air in the fluid, (makes the hydro fluid "frothy")
spraying ANY lubricant on the belts will cause them to slip and make a squeaking/squealing noise.

check the location of the leak, wipe down the hoses (cheap causes for leaks) fill the power steering. put some newspapers under the car, start the car, turn the wheels lock to lock, shut off car, check for leaks, should tell you if it is a hose or connection, or rack unit

Posted on Apr 16, 2012

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Does my coolant tank need repair or do I just need to add coolant?


do not use water. During freezing nights, the water could freeze. when water freezes, it expands. when it expands it can crack your engine block. Do you see anything leaking under the car when its running? Does your car constantly blow smoke out the exhaust?

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well simple answer is it is only losing coolant when under presure so i would tighten all coolant hoses to be sure they are air tight then start the engine leave untill the fan comes on then check for a leak as will be under presure if you find the leak dont work on the cooling system untill compleatly cooled down then remove coolant cap then fix the leak fillwith coolant to just under max level replace coolant cap and start engine leave running untill fan kicks in and then see if leak has sealed dont forget check around cylinder head when checking for leaks

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I think we all just live in a world of automobiles,that have
too much high tech technology,when not so much is needed,
just to keep exhaust emissions at an acceptable level

At least you kept going back to the dealer & not keep driving
as most people do

You gave the dealer techs several chances at resolving the issues,
all be it, expensive, to say the least.

I don't see anything where you went wrong, or they let you down,
assuming your good to go & no more issues

I assume that the head gasket was something that only moved
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If you are saying that it comes on now and then, and goes off, your may just need to add Anti-freeze/boil to the overflow tank. Does it come on when you're coming to a stop or going up or down a hill, if yes, add coolant to the overflow tank to bring it up to the correct level, not the radiator.

A small loss over a long period of time is acceptable, but constant refilling, indicates a leak either internally, with the coolant exiting through the exhaust, or one that you should see under your car occasionally. Sometimes you'll find your coolant leak in the floorboards if the heater core or hose leaks.

If your sensor comes on after driving a while & goes off as a result of adding coolant, then you'll probably need to pressure test the cooling system to identify where the coolant is going. Bad hose, seal, headgasket, head, etc.

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1 Answer

2004 saturn ion coolant light Keeps appearing


If you are saying that it comes on now and then, and goes off, your may just need to add Anti-freeze/boil to the overflow tank. Does it come on when you're coming to a stop or going up or down a hill, if yes, add coolant to the overflow tank to bring it up to the correct level, not the radiator.

A small loss over a long period of time is acceptable, but constant refilling, indicates a leak either internally, with the coolant exiting through the exhaust, or one that you should see under your car occasionally. Sometimes you'll find your coolant leak in the floorboards if the heater core or hose leaks.

If your sensor comes on after driving a while & goes off as a result of adding coolant, then you'll probably need to pressure test the cooling system to identify where the coolant is going. Bad hose, seal, headgasket, head, etc.

Good luck !

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collapsed hoses cause water flow constriction
.that increases temp fast

to bleed air out of the system . if no air bleeder as such
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loosen the bypass pipe for the closed thermostat till only coolant flows no air bubbles
check if
the engine cooling fan spinning fast enough
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the interior directional flaps motors or actuators working

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