Thread: rangie operating temps

What was the cause of the head gasket failure??is it still there??
Is the cooling system properly bled and pressure tested.
How old is your radiator is it the original 86 unit??
How is the water pump??

The 2 fans in front usually are for the air con condensor, why does the thermo fan run continuously is it telling you something or is it not wired with a t/stat. Also what diameter is the fan and does its cowling cover the whole radiator??

Hope this helps.

Hi Ferno
Bleeding thermostat problems :roll: :roll: :roll: :roll: :roll:
You may have air trapped in the system,if your thermostat hasnt got a bleed hole to allow air to pass thru,drill a small hole.If air is blocked at the thermostat the hot water wont open the thermostat.
Also a trap for new home mechanics,is the thermostat installed the correct "way around" ops: ops: ops: ops: ops: ,should have "to rad" stamped one side,many dont.The spring side needs the hot water flow against it to make it open.
Best of luck
Andrew

Have you been up Cunningham's gap on a hot day before with only one electric fan with no probs.
Under about 60Kmh the fan plays a role as you go slower. One electric fan has about 1/10 the cooling capacity of a viscous.
Why not borrow a viscous and try it?
Dirty rad, no viscous would be my picks.
Regards Philip A

Ferno, having owned a 3.5 for some time now I can tell you the guage gets to the middle slowly,, but never EVER moves more than a needle width either way, deserts, northern territory highway, city traffic, NOTHING makes it move.
8)

Seal on radiator cap going?

I've got that at the moment, I can just see dribbles of dried coolant around the top of the bottle.

Cheers
Simon

Sounds like a radiator blockage if the temp goes through the roof.

I've found that a rad clearout is good practise every 1-2 years or so. I've always had them done every year and found most of my cooling problems are non-existent.

Did you replace your water pump? I know it costs a bit extra when you are doing any sort of engine work, if your original was a bit suss I would replace it for the sake of eliminating headaches.

Stupid question, you did put the gasket on the right way? Also did you gradually tourque your heads ot did you just go straight up to 70ft/lbs or whatever they are (can't remember what the torque setting at this point in time).

Just some ideas of where to start. Thermostat also as well as air trapped in the system as others have mentioned.

Good luck,

Trav

Somtimes the rad hoses will squash flat if the rubber in them has gotten week.
Get the temp to go over half after a short run , then pop the hood look in and give the engine some hi revs by hand , you may see that the water pump sucks the pipes together as the thermostat opens up 8O .
I have had cars in the past that have done this.
hope it helps. :wink: .

:roll: ok,from the top,


DRanged Posted:
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What was the cause of the head gasket failure??is it still there??
Is the cooling system properly bled and pressure tested.
How old is your radiator is it the original 86 unit??
How is the water pump??

The 2 fans in front usually are for the air con condensor, why does the thermo fan run continuously is it telling you something or is it not wired with a t/stat. Also what diameter is the fan and does its cowling cover the whole radiator??

Hope this helps.

cause of original problem was a lower rad hose blowout,possible caused by dicky thermostat,hose and thermostat replaced

system bled as best i can do, but i dont have a pressure tester

have only had the vehicle a month or so ,so cant tell how old the rad is

the water pump "seems" to be working ok

not sure why fan is permanently on ,it does have a t/stat wired in but maybe not working or adjusted rite

and this is where i tend to lean towards the probs ,the fan only covers about half the rad as does the cowling


next :roll:


LandyAndy --------------------------------------------------------------------------------

Hi Ferno
Bleeding thermostat problems
You may have air trapped in the system,if your thermostat hasnt got a bleed hole to allow air to pass thru,drill a small hole.If air is blocked at the thermostat the hot water wont open the thermostat.
Also a trap for new home mechanics,is the thermostat installed the correct "way around" ,should have "to rad" stamped one side,many dont.The spring side needs the hot water flow against it to make it open.
Best of luck
Andrew

thermostat is a new one ,it has a bleed hole in it,and i am far from a new home mechanic :roll: i think if i can tackle a head gasket job on a V8 then i should know how to put in a thermo (first job was two years mech app :roll: )besides ya just put it in the same way it came out


next

PhilipA--------------------------------------------------------------------------------

Have you been up Cunningham's gap on a hot day before with only one electric fan with no probs.
Under about 60Kmh the fan plays a role as you go slower. One electric fan has about 1/10 the cooling capacity of a viscous.
Why not borrow a viscous and try it?
Dirty rad, no viscous would be my picks.
Regards Philip A


where did you get cunninghams from? and no,i havent been up there before as i have only just purchased this vehicle(may have been a big mistake ops: )any one got a spare viscous and shroud?


next,

Pedro_The_Swift

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Ferno, having owned a 3.5 for some time now I can tell you the guage gets to the middle slowly,, but never EVER moves more than a needle width either way, deserts, northern territory highway, city traffic, NOTHING makes it move.



except for a very hot motor,thermostat opens in a saucepan of water just as it boils,seems strange that it has to boil before it opens,thought it would have opened a little earlier than that


next,

abaddonxi
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Seal on radiator cap going?

I've got that at the moment, I can just see dribbles of dried coolant around the top of the bottle.

Cheers
Simon


have tried a couple of different caps,no difference :roll:

next

aquarangie

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Sounds like a radiator blockage if the temp goes through the roof.

I've found that a rad clearout is good practise every 1-2 years or so. I've always had them done every year and found most of my cooling problems are non-existent.

Did you replace your water pump? I know it costs a bit extra when you are doing any sort of engine work, if your original was a bit suss I would replace it for the sake of eliminating headaches.

Stupid question, you did put the gasket on the right way? Also did you gradually tourque your heads ot did you just go straight up to 70ft/lbs or whatever they are (can't remember what the torque setting at this point in time).

Just some ideas of where to start. Thermostat also as well as air trapped in the system as others have mentioned.

Good luck,

Trav

rad seemed clean ,put the hose thru it tonite ,backflushed, and it flowed quite freely,yes, i put the gaskets on rite,it said top on one side ,so i put that side to the top of the motor



nah,just kidding

and yes, i did it in three stages

next

joe :

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Somtimes the rad hoses will squash flat if the rubber in them has gotten week.
Get the temp to go over half after a short run , then pop the hood look in and give the engine some hi revs by hand , you may see that the water pump sucks the pipes together as the thermostat opens up .
I have had cars in the past that have done this.
hope it helps. .


most hoses are well and truly expanded by the time it gets hot :roll:

thanks for the info guys ,am leaning towards the fans being the problem,so need to find a viscous coupling and fan blade and shroud, any one got a spare lying around?