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Car over heating very quickly
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atsproperty
Novice
May 3, 2012, 8:13 AM
Post #1 of 10
(1773 views)
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Car over heating very quickly
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1993
Mazda
929
v6 24 valve
93,000 miles
I bought a car that had had the fan clutch go out and the fan went into the radiator.
What I have done-
replaced fan clutch
had radiator fixed and flushed
replaced the bottom thermostat and new thermostat housing
I also replaced spark plugs and new belts(fyi)
put it all back together and filled up radiator and drove a 2 block radius and the temp went to redline that fast.
now any car ive ever worked on has always had the thermostat on top...there is a top radiator hose so is there a top thermostat?
the housing on top looks about half the size of a typical thermostat housing with a elctric wiring going into top of it.
Hope I have described my situation well enough.
Please reply..
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 3, 2012, 8:22 AM
Post #2 of 10
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Re: Car over heating very quickly
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You gotta help me - is this critter RWD? Fan clutches - those that attach to water pumps were common on RWD vehicles and yes when failed could take out your radiator or worse. It may have seriously hurt the water pump or it isn't actually full of coolant yet are high on the list if this is the layout I'm thinking it must be by your description.
To add to that. Not many radiators were fixable even in '93 and that could be an issue as well,
T
(This post was edited by Tom Greenleaf on May 3, 2012, 8:24 AM)
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atsproperty
Novice
May 3, 2012, 8:34 AM
Post #3 of 10
(1751 views)
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Re: Car over heating very quickly
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RWD - rear wheel drive?
Yes it is rear wheel drive.
I took the radiator to a radiator shop and had it fixed..it just had one pin hole in it.
it could be the fluid level..I used only water at this point incase it didnt fix the leak I didnt want to waste anti freeze.
is there something in the top thermostat housing the could be froze up?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 3, 2012, 8:49 AM
Post #4 of 10
(1742 views)
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Re: Car over heating very quickly
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Gotta guess 'cause I don't know the car. If a pin hole could be fixed then great and doubt that's it. If thermostat could be put in backwards that could be the problem - most won't go in wrong.
Water is fine for a test and should work but when known good get antifreeze mix in right away. Filling cooling systems vary by how much of a pill they can be to really be full. Generally by the time the heater works there's adequate coolant but who knows for sure? It should be a "closed" system with recovery tank right off of radiator cap such that air pushes out and only liquid returns. Just filling a recovery tank isn't the way to fill a system. Must be full in the engine and over time it would purge out small amounts or air.
Of course air isn't a good heat exchanger, liquid is.
What you need to do is verify cooling system is full first and avoid any overheating. Last bit if this doesn't require tricks will be stable when level quits dropping and you need to warm it up till there's pressure and t-stat has opened then let cool down a few or more times OR pull a high up hose and fill from there on some. Should require it but now with more PITA vehicles to fill the system is put under vacuum and filled that way.
If the pressure cap is on recovery tank it will be a pest. If on radiator it's better. Some, and this is trickery without tons of equipment may respond to jacking up the car such that the fill cap (check that it works too) is the highest point.
In that this overheated so quickly my first bet is that it isn't really full of liquid water or not. Hope that in overheating no head gasket issues are in play with this too,
T
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atsproperty
Novice
May 3, 2012, 9:09 AM
Post #5 of 10
(1736 views)
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Re: Car over heating very quickly
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ok I'll double check the fluid level of radiator and run it til the thermostat should open a nd close a few times.
I think I will remove top housing to see if anything is seized up. (there has to be some kind of coolant flow because there is a top
radiator hose... also couldnt i run the car with rad. cap off to watch for flow?
p.s. when I return in a few days to give update on this thread will the thread post back at the top of the page or will it be lost in the hundreds of post
to come?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 3, 2012, 9:40 AM
Post #6 of 10
(1728 views)
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Re: Car over heating very quickly
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Yes, in some system with rad caps you can see it flow once t-stat is open. (WATCH OUT IF IT GOES NUTS AND BLOWS STEAM AT YOU!) Just FYI - I'm here a lot but not 24/7 so others may catch this or I could be late to reply,
T
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atsproperty
Novice
May 6, 2012, 4:22 PM
Post #7 of 10
(1651 views)
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Re: Car over heating very quickly
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Ok update : Today I took off the housing that is attached to the upper radiator hose. it has 3 electric connections with what I assume is some type of temperature sensors going into this housing. Cleaned it out just a little rusty but there is one small hose coming off this going to another part of the car and it was filled with thick dark grim. I cleaned out this hose and put things back together. I added about 1 1/4 gallons of antifreeze until it wouldnt take anymore. I started the 93 mazda 929 v6 with out the radiator cap on it. ran the car for about 5 to 7 minutes at idle only but with the air conditioner turn on high. at this time im watching the flow and at about the 7th minute its bouncing and spalshing out of the open port of the radiator. the temp gauge at this point is slightly over half way up.
At this time I turned off the car looked around to see if there are any leaks but dont see any. I put the radi cap back on and started up the car and let it idle after just a few minutes with the air on and idle only its creeping up the temp gauge and once it topped the white line I shut it off.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 7, 2012, 12:13 AM
Post #8 of 10
(1636 views)
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Re: Car over heating very quickly
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Smacks of exhaust gasses getting into cooling system and game over for head gaskets or more................
T
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atsproperty
Novice
May 7, 2012, 6:35 AM
Post #9 of 10
(1622 views)
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Re: Car over heating very quickly
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what? Im sorry I dont understand that. There is no oil in the water/antifreeze I know that.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 7, 2012, 8:40 AM
Post #10 of 10
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Re: Car over heating very quickly
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Doesn't have to express itself that way. Anything it (they seal) can leak anyway they seal. If you don't know that then put the wrenches down!
T
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