Question about Kia Sedona

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Losing coolant thro the expansion tank at a rapid rate, 4 litres after 40 miles, no visable leaks, rear heater pipes replaced and new rad and water pump

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  • Anonymous Sep 17, 2008

    Have the same problem With 2002 Kia Sedona.

    Losing Coolant Reservoir every 3-4 days.

  • mrdalton76 Dec 28, 2008

    I am having same issue with my 03 sedona. I am going to replace the

    thermastat. It loses coolant over a weeks time but does not get drove far.



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Not too familiar with this model but.... First some questions! Has the fault started after the pipes & rad replaced or were they replaced to remedy problem? If fault happened since work then i'd suggest an air lock in the system in which case you will need to 'bleed' the system of air. Make sure the expansion tank is the highest point & look for any bleed valves on the hoses - usually near the heater matrix. Sometimes it may be necessary to help the process by removing the temperature guage sender unit to allow the air to escape as air cannot pass through a closed thermostat. If the fault was there before, does the expansion tank seem to build up pressure very quickly? Do lots of air bubbles appear with the engine running & the pressure cap off?

Posted on Aug 22, 2008


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Why is the coolant overflowing when the temp guage gets half way?

well the tank must never be full, when engine is cold
was it? (read operators guide to see methods)
water expands hot, and the tank captures this expansion
that is normal.
what does "until its all gone", mean, what is IT?
there are lots of tests.
the first one, is,
IS the engine overheating,?
try a new rad cap, they are dirt cheap.
and, is the oil or carbon in the RAD neck, cap off , cold engine>?
is there water in the engine oil, milky dip stick end?
same with A/T trans? milk, or pink/red ATF.
is there steam going out the tip of the exhaust pipe on a fully hot engine>? yes/no?
is air and water exploding in to the side expansion tank.?

cold engine
remove rad cap'
fill rad with 50% AF.
new cap back on.
put 50% AF 1/2 way up in to expansion tank(its marked clearly)
start engine , does it overflow now>?

Jul 04, 2014 | Saturn SL1 Cars & Trucks

1 Answer

Aud1 a4. overheated. water reservoir not keeping water and leak into front passenger footwell

I'm assuming for now that these are two separate problems:
1. Overheating and emptying expansion tank.
2. Leak into front passenger footwell.

Solution to 1. is likely to be a crack in the expansion tank. This happens often with these tanks. Look under the cap and you'll find two necks. The narrow one is the pressure tube that the lid seals in to. Check the narrow neck for any cracks and check the pressure cap o-ring for condition. Replace both if suspect. They're cheap from FCP Euro or ECS tuning.
The wider neck is the overflow. This drains into a small tube under the lid area of the tank. You could connect a hose to this if you were so inclined, but it normally it just drains into the engine bay (onto the left hand exhaust manifold normally on V6's!). If yours is losing the coolant from here its a classic sign of a cracked filler neck.
Make sure the cooling system gets bled properly as well - top bleeder is the right hand heater hose (factory hose if still on the car will have a hole marked by a white circle - pull the hose off the heater core connection tube to expose this hole to the coolant, undo and raise the expansion tank above the heater hose level to bleed).
On V6's the lower bleed is on the engine cross flow pipe on the rear of the engine on the opposite end to the engine temp sensor - 6mm allen key undoes from memory. Not sure where lower bleed is on 4 cyl models - possibly the coolant pipe in the vicinity of the inlet manifold.

The other possibility for 1. is a failed cylinder head gasket, but I'd be suspecting the expansion tnk ahead of this. Seek professional help if the expansion tank isn't the issue.

2. I would suggest is a blocked plenum chamber drain. You can check by pouring some water down the windscreen with the bonnet (hood) open and seeing if the plenum area fills up without draining or draining slowly. Main drain is in the middle I think and It gets clogged by leaves and debris. Cleaning is difficult, but you can try a shop vac with some heater hose taped to the nozzle to try and get in there, or some compressed air with an air gun or something to try and blow it through.
Search something like "Audi B5 plenum drains" on Google and you may find some other suggestions.
2. may also be blocked HVAC drains for the airconditioning...

Jun 09, 2014 | 1997 Audi A4

1 Answer

I have a vr6 and water is gushing out of my expansion tank after a short drive there is brown gunk in tank too

Sounds like you need a complete coolant flush. It should never be brown and gunky, ever. A good flush and pressure test will make it like new again. It's boiling back into tank because it cannot circulate properly. I would guess it may be a bad rad, or heater core. Good luck I hope this helps please rate my solution

Jan 06, 2013 | Cars & Trucks

3 Answers

What is the reason for losing water/

could be you have a leak in one of you hose,s

Dec 08, 2012 | Cars & Trucks

1 Answer

Leaking coolant Mk3 golf - radweld or new pipe?

Sorry RADWELD will not do it. Can't help with the pipe i'm afraid

Oct 12, 2012 | 1996 Volkswagen Golf

2 Answers

I have an audi 97 a4 6 sylander and i had to change the metal pipe wich transfer water from reservor to termostat housing do i need to bleed the system after fix and soo wher is the bleeding valve thanks...

you dont have to bleed the water it automatically takes out the air when it runs and the thermostat valve opens check the level again after a run of 5 miles or when the temp is in the middle

remember not to check when the engine is hot

Feb 07, 2011 | 1997 Audi A4

2 Answers

A Toyota hiace, overheating, no present leaks

exhaust gas coming thru the resiovoir, sounds like a head gasket

Jul 17, 2010 | 1985 Toyota Passenger

2 Answers

Water leak from cooling system, carn't see a water leak and have tried a bottle of rad weld, but its still loosing around a litre of water to every 50 miles. Any suggestions for self repair and where to...

If there isn't water obviously appearing from somewhere it's either a head gasket failure or radiator cap. Check the oil filler cap for emulsion. Just hope that it's the radiator cap.

Oct 20, 2009 | 1996 Volvo 960

1 Answer


replace your coolant reservior cap; the rubber ring has become brittle and "steams" the coolant out as you drive

Apr 21, 2009 | 1997 BMW 318

2 Answers


that's the problem
yes, you have to take the coolant filling cap off " expansion tank cap "
turn your car on for at least an hour
the bmw line has a very bad problem wich is " bubbles " inside your water system
you have to have your car inclined and running without the cap so he can bleed all the bubbles out.
sorry you spent all that money but after you replaced the radiator all you had to do was that, to get rid of bubbles.

so, do this. park your car on an incline position, engine up.
remove the cap. let it run for at least an hour.
refill as needed " coolant "
do that the following morning and for last refill the collant as needed.
problem should desapear.
hope this helps

Jun 08, 2008 | 1999 BMW 318 ti

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