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over-heating probs 

 

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 Post subject: over-heating probs
Posted: Mon Nov 06, 2006 11:34 pm 
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hey all,

Car is a '91 EA 6, it all started about 3 weeks ago car was running a bit hotter than usual but i thought nothing of it. As the weather has heated up so has the motor and on the weekend on a 200K drive it decided to boil over, i let it cool down, drive another 15-20 and she boils over again.

So i get home sunday, the whole system gets flushed, new hoses get thrown on, top-notch coolant goes in, start it up and run it, its heats up the thermostat opens and the water isnt flowing through, its just staying in the over-flow tank. it was at this point i knew i had a problem....

im thinkin a blockage in the head maybe???

just wondering if someone could help me out here, maybe let me know how to diagnose this further, repair the prob if it is blocked or even with a price of what it would cost to fix...

sorry about the novel but i thought the more info i gave the more everyone could help

thanks again

 

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Posted: Tue Nov 07, 2006 12:25 am 
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u change the thermostat and rad cap?
both can have an effect on cooling
a leaking cap will allow the the coolant to absorb less heat and boil faster while a faulty thermostat may not open enough to allow suffecient coolant flow through the engine

water staying in the overflow tank is fine
the over flow tank is named that fora reason
when water heats up it expands and needs somewere to go
hence the overflow tank when the coolant cools down it shrinks and becomes more dense and coolant is drawn back into the cooling system ( rad )


your rad could be partilly block and may need to be removed and flushed at a rad joint

 

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Posted: Tue Nov 07, 2006 12:51 am 
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new thermostat and the cap is find because the system is pressurizing.

true, but when your doing a dry fill as soon as the thermostat opens wont the water drain out of the over-flow to fill the water jacket?

 

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Posted: Tue Nov 07, 2006 12:51 am 
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Thermostat 1st, blocked rad second, the best coolant in the world wont do s**t for over heating
You said the thermostat opened, are you sure of that?
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Posted: Tue Nov 07, 2006 12:54 am 
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yeah, im positive, i even removed it and tried just to be sure.

 

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Posted: Tue Nov 07, 2006 1:08 am 
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So you dropped it in hot water?
Water flow problems are usually 3 things, thermostat, radiator, and unusual but chewed rotors on the water pump, have done quite a few of those over the years.
Fords are well known for blocking radiators, most of it is caused from sand when the blocks are cast, it takes a long time for it to come out.
It could well be a head gasket problem too, but it's always hard to diagnose via internet... We can only give advice on what you tell us.

Last edited by Walker on Thu Nov 09, 2006 9:04 am, edited 1 time in total.

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Posted: Tue Nov 07, 2006 1:15 am 
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this might be a dumb question, but how can i test the radiator to see if it has sufficient flow?

could i run the car so its warm and put my hand on the radiator and test for hot/cold spots? would that work

 

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Posted: Tue Nov 07, 2006 1:45 am 
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take the thermostat out and stick a hose down the upper rad hose... if water comes out the thermostat housing at a decent rate then the system is flowing and you might have a problem with something else... water pump probably
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Posted: Tue Nov 07, 2006 8:25 am 
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The only way you can test a radiator is to remove the a side tank and examine the flow through the tubes. Putting a hose in one end and seeing water flow out the other only proves that not all of them are blocked. You can get them cleaned out, however the cost is around 75% of a new one.

You can test your thermostat by putting it in boiling water. It should fully open.

 

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Posted: Tue Nov 07, 2006 11:42 pm 
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i took the thermostat out of the housing just to eliminate it and i still dont have any flow, does anyone else have any ideas on other things i can try? otherwise im going to have to the old girl down to the mechanic...

 

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Posted: Wed Nov 08, 2006 1:07 am 
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Use the hose dude

It will tell you if the radiator is blocked or if the pump is stuffed

Cheers
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Posted: Wed Nov 08, 2006 1:18 am 
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Quote:
TwistedEL Posted: Mon Nov 06, 2006 10:45 pm Post subject:

--------------------------------------------------------------------------------

take the thermostat out and stick a hose down the upper rad hose... if water comes out the thermostat housing at a decent rate then the system is flowing and you might have a problem with something else... water pump probably


can you explain that again, im not getting ya ?

 

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Posted: Wed Nov 08, 2006 1:28 am 
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Open up the thermostat housing
Put your garden hose down the hose that runs between the housing and the radiator
Turn on hose

If water comes spewing out of the head then the radiator is not blocked, or at least it is allowing water through - and the likely problem is a stuffed water pump

If it does not then you have a blockage in either the radiator or the head somewhere

Cheers
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Posted: Wed Nov 08, 2006 6:49 am 
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insufficient air flow through the radiator, blocked up with bugs & s**t maybe.

 

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Posted: Wed Nov 08, 2006 9:29 am 
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TwistedEL wrote:
Open up the thermostat housing
Put your garden hose down the hose that runs between the housing and the radiator
Turn on hose

If water comes spewing out of the head then the radiator is not blocked, or at least it is allowing water through - and the likely problem is a stuffed water pump

If it does not then you have a blockage in either the radiator or the head somewhere

Cheers


Read my post ^

A Hose will only prove the radiator is not fully blocked!

 

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