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Thread: 2000 Mazda MPV overheating - headgasket?

  1. #1
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    2000 Mazda MPV overheating - headgasket?

    Hi all,

    this car has had a history of being great and reliable until we took it off the road 6 months ago due to it not passing a roadworthy..got ourselves in a situation where I had to get under, sort it out to pass RWC and all appeared to be okish.

    noipics was driving it and when it started heating - steam coming out of the overflow pipe and high temps was the only symptom though when we had ti checked out by th elocal mechanic for another issue, he noted that it looked like a coolant leak and to keep and eye on it.

    Anyway car got hot, limped it home stopping every 5 minutes or less waiting for it to cool down.

    This is what I did so far.

    Checked hoses, couldn't see a leak anywhere as it saeems to be all escaping via the reservoir.
    Took out thermostat, haven't donw the test of putting it in boiling water yet as I have assignments to do.
    ran the car without the themostat - it still overheats.

    Is there anything else I can do, anything that I have missed (I am sure there is)

    it seemed to run fine and manage temp idling for 15 or so minutes, took it driving then overheats.

    I am worried that it's a headgasket so this is just a matter of cashing in the rego again and then trying to sell it to a wreckers.

    We are in a shit spot currently as the nopics is on 7 more weeks of full time clinical placement with varius shifts on the sunshine coast which is a 50 minute highway commute either way and I have no car to take the kids anywhere if there is an issue.

    Any tips would be great any PF'ers on Bribie that could lend a hand would be much appreciated.

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    just checked thermostat - it appears to be in the stuck open position and boiliung water has no effect.

  3. #3
    Purist, whats that? Jason Broadhurst's Avatar
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    Leave the thermostat out for now just to take one variable out of the equation.

    Does the water level in the radiator change as you rev the engine?
    Jason Broadhurst

    Someone once asked me if they could use my mower. I said "sure, so long as it doesn't leave my yard"

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    Ok, at idle it seems to be okay, needle sits in the middle..

    The Cooolant bottle level will change and I can see the steam com,ing out of the overflow pipe.

    over a period of say 15 minutes or so the level in the reservior will go from Full to just below the Low line but stay there there is no radiator cap on this as far as I can see which seems to be a great idea.

    So I can't see any leaks although there seems to be a bit under the thermostat housing but really not much, the majority seems to be coming out of the reservoir bottle.
    Last edited by jgryder; 01-06-19 at 03:34 PM.

  5. #5
    Gas Turbine enthusiast da9jeff's Avatar
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    Could just be the radiator cap (fitted to the overflow in the is case).

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    Registered User THE CHIEF's Avatar
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    Yep, a shot radiator cap can cause your issue. That would be the first thing id replace.

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    it looks like some cheap arse china crap but the cap was new with the reservoir which was replaced as it had a crack. - only $15 or so to replace the cap so I can certainly do that.
    Last edited by jgryder; 01-06-19 at 04:40 PM.

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    ok, I replaced the china cap with what looks to be a much better tridon cap and too it for a 15 minute drive, no overheating.

    When I got it back, popped the bonnet and there is a bit of steam coming from the overflow and within the coolant bottle heaps of churn within the bottle but I am not sure if that is normal as I've never noticed it before. Is having no thermostat the likely cause?

    But it seems better and may just get us out of trouble..the next thing is a weird fluctuating/pulsing between 1000-1500rpms - which is a bit freaky coming into roundabouts. If I can get that sorted
    Last edited by jgryder; 02-06-19 at 11:24 AM.

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    Spoke too soon ean fine for a bit but started overheating again today. I have to drive for exams next week so that should be Interestng.

    Any other thu gs to look at?

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    Resident Oaf Jim's Avatar
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    Youíll find itís done a head gasket.
    Fill the overflow bottle as full as it can go. Run the car with the cap off. . If thereís big bubbles coming up then it needs a head gasket.
    Turns out, far too much has been written about great men and not nearly enough about morons


    Quote Originally Posted by seedyrom
    my neighbours called the cops...... not because of the sound of me working in the garage was too loud, but because i taped a cardboard box to my back, covered my self in vaseline and pretended i was a snail on their lawn

  11. #11
    Gas Turbine enthusiast da9jeff's Avatar
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    Yeah if it's heating up in cool weather and all the basics are sorted, it'll be a BHG. Could try chemiweld as a last ditch effort if the alternative is scrapping the car.

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    Quote Originally Posted by Marlin
    Chickens will slip under water in the cover of darkness like a seal team and FUCK YOU UP.

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    Quote Originally Posted by Jim View Post
    Youíll find itís done a head gasket.
    Fill the overflow bottle as full as it can go. Run the car with the cap off. . If thereís big bubbles coming up then it needs a head gasket.
    I'll try this tomorrow, worst possible time, nopics has to be on shift on the sunshine coast that day and I have to go do my exam and be back to pick up the kids.

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    Thanks guys, basiaclly I want the car to do this.

    2 trips to the sunshine coast - 66 km each way? possible?

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    Resident Oaf Jim's Avatar
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    Possible but extremely high risk youíre going to be left stranded. I wouldnít recommend it.
    Turns out, far too much has been written about great men and not nearly enough about morons


    Quote Originally Posted by seedyrom
    my neighbours called the cops...... not because of the sound of me working in the garage was too loud, but because i taped a cardboard box to my back, covered my self in vaseline and pretended i was a snail on their lawn

  16. #16
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    no cool, I'll organise something else, either borrow a car from a friend or see if there are some public transport options as its the worst place to be stranded along that stretch of road.

  17. #17
    Registered User matty12's Avatar
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    I would pull the rad and make sure its clean by taking the tank off, this could be the beginning of you dramas pushing water out now it has airlocks making it look like a head gasket. Make sure you have circulation by checking the heater heat with fan flat out, it shoukd maitain reasonable heat( some waterpump impellors fall off etc) If its rad is clean, all air purged from the system then look at gaskets.

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    Quote Originally Posted by Jim View Post
    Youíll find itís done a head gasket.
    Fill the overflow bottle as full as it can go. Run the car with the cap off. . If thereís big bubbles coming up then it needs a head gasket.
    On the way home from the gym, head a pop, blew radiator cap off - so not sure wtf that was noticed the spout of the collant bottle looks a bit deformed?

    I kept it running, filled up the bottle to the top and revved it, could definately see the water/coolant getting bubbly?

    So it is likely to be headgasket or dodgy replacement reservoir?

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    Head gasket.

    Pull dipstick - does the engine oil look like a milkshake by any chance?
    Last edited by andy_wk; 07-06-19 at 12:18 PM.

  20. #20
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    This is what is confusing, the oil looks fine or it did this morning when I did all of this.. Wtf?

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    Registered User matty12's Avatar
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    You need a split/ crack between oil gallery and cooling system to get oil in water, most head gasket issues is just combustion pressure straight into the cooling system.

  22. #22
    bitch lasagne Bob Vegana.'s Avatar
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    Yeah, a Tee-Kay carbon monoxide test would confirm it.
    Quote Originally Posted by brewdles View Post
    In short, some cunt at test and tune had a 250cc honda turning to 11ty and it sounded porn. Do that.

  23. #23
    Resident Oaf Jim's Avatar
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    Let me save you some diagnosis time.
    Itís the head gasket.

    They often blow and allow compression pressure into the cooling system without causing water to get into the oil.
    Turns out, far too much has been written about great men and not nearly enough about morons


    Quote Originally Posted by seedyrom
    my neighbours called the cops...... not because of the sound of me working in the garage was too loud, but because i taped a cardboard box to my back, covered my self in vaseline and pretended i was a snail on their lawn

  24. #24
    Registered User THE CHIEF's Avatar
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    As mentioned earlier, chemiweld could possibly be your best friend. Ive seen it allow cars to run for years after and have also experienced it do nothing useful. You don't have much to lose by giving it a shot.

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    I have gone the chemiweld route and we'll see how it goes, going to trade it in on another small and new car so end of story

  26. #26
    Real life axe man Justin Bieber's Avatar
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    That chemiweld is brilliant stuff. My old feroza spat the entire gasket behind #4 clean out, was pissing coolant everywhere. 1 bottle, still leaked, 2 bottles you ripper. Parked it and found something to trade it in on, drove it straight there and got that warm fuzzy feeling of fucking over a car yard. They didn't even pop the bonnet. I did however see the bonnet up a week later when it was parked out the back heh
    Quote Originally Posted by FatBoy View Post
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