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Old 12-04-2002, 19:40   #1 (permalink)
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Overheating.

I'm not sure if this has been covered by anyone else before.....

Lately ive been noticing my car overheating on hot days. This happens while driving through the city (Sydney).
In normal traffic conditons the temp sits at 1/3 with no a/c, and 3/4 with the a/c on.
When traffic is heavy (stop starting) it sits on the red with a/c on. As soon as I turn off the a/c it goes straight back down to 1/3 - 1/2.

Do i have a blocked radiator?... should I replace the coolant ?

My fan clutch was replaced earlier this year.
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Old 12-04-2002, 22:33   #2 (permalink)
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Take out the radiator out and blow the grass seeds, dust and bugs from your A/C condensor and the radiator. Then flush the system.

If that doesn't work try a cooler thermostat in the summer months.

Also if it is a aluminium radiator, it could have a build up of scum on the inside of the core that doesn't allow the transfer of heat. You can't Flush clean them because the costic based cleaner eats aluminium. If possible buy a brass cored radiator, did wonders for my EB.
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Old 12-04-2002, 23:46   #3 (permalink)
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Could be the water pump. When's the last time it was replaced?
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Old 12-05-2002, 01:37   #4 (permalink)
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Quote:
Originally posted by JG33
Could be the water pump. When's the last time it was replaced?
I dont know... definately hasnt been replaced since ive owned it.. 80,000k's ago.
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1993 EBII Fairmont Ghia 5.0L Wagon,
Lowered, Tinted, 17" Speedy Ravens & 2.5" Sports Exhaust.
( 1 of 26 built )

AND

1985 Telstar TX5 Turbo, stock as a rock.
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Old 12-05-2002, 03:06   #5 (permalink)
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My car does the same as yours, the cooling system gets flushed regularly and the thermostat was replaced 2 years ago.
On a hot day the temp gauge stays halfway but once the air con comes on the temp gauge goes to the red.
My theory is either the aircon compressor bearing is seizing up but then you would probably hear some sort of noise or and more likely the waterpump impellor has corroded and isn't circulating the water in the engine much.
Haven't done anything yet, waiting for the Christmas break.
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Old 12-05-2002, 16:31   #6 (permalink)
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My ED Sprint deos the same but only between a third and three quaters on the temp gauge.Have purchased EL thermos and getting three core brass radiator,will let u know the results.
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Old 12-06-2002, 01:28   #7 (permalink)
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Thanks for the replies guys.
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Signatures are for poofs !!

1993 EBII Fairmont Ghia 5.0L Wagon,
Lowered, Tinted, 17" Speedy Ravens & 2.5" Sports Exhaust.
( 1 of 26 built )

AND

1985 Telstar TX5 Turbo, stock as a rock.
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Old 12-06-2002, 11:54   #8 (permalink)
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Check out this EBP electric water pump, we have been talking about it in the "E Garage". Just the job for hot summers. I've just ordered one so I'll let youse know how it goes.

http://www.daviescraig.com.au/
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Old 12-06-2002, 21:30   #9 (permalink)
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Because of the design of the engine bay in the XDs onwards, they tend to run hot, due to lack of air circulation. Just have a look at the engine bay of an XA, B or C and see the difference.

Because of the emission laws, the engines are also designed to run hot, as that assists in the dissipation of the gasses etc. The temp. gauge is configured accordingly by adding resistors in the right spots.

It is essential that the cooling system is maintained, and this generally means an annual flushing, with radiator renewal every 5 years or so, as the tranny cooler also sits inside the rad. and tends to dissolve over the years.

The main reason that the car tends to overheat in hot weather is the above not being done, and also look between the aircon. heat exchanger (rad) and the radiator, as this can also be filled with gunk.

A lot of EAs onwards end up beside the road with the binnet up in hot weather simply because the cooling system has not been maintained.
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Old 12-07-2002, 13:40   #10 (permalink)
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Here is a good idea for a filter for the top radiator hose, good pictures show the results.

http://www.jag-lovers.org/xj-s/book/CoolantFilters.html
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