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Radiator cap i have a suzuki splash car and have drained off the coolant and put back the hoses and need to refill with fresh coolant. do i fill up via the cap on top of the radiator (i am having difficulty getting it off) or via the expansion tank. anyone ?

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  • 20,706 Answers

Old post.
yes the RAD cap
car has 3 diff, engines. so. can;t be specific.
what year 2008+?
ok, allcars,
you fill it to get the block full and the Radiator to the top
the side tank , only major function is for the cool down.
during cool down it allows the RAD to **** back coolant, as she cools.
it also prevents green AF on the pavement as engine gets hot.
that second part is for pollution rules.

the car has a FSM, manual, in there are rules for your car and you opted engine.
The plumbing on all cars , all engines, very by same.
FWD, RWD, too.
as does some other options. (block eaters?)

if you read service books
it tells you, to burp the engine and rad.
I run the engine for 2 heat cycles, and then when cool
i check that the rad fluid is full to the top of the RAD.
Here is what id do , (assumes thermostat not pulled)
I fill the rad with 50% AF.
i run motor util it starts to expand, if the level drops as i run motor
I add more, then when the AF starts to leak out, I cap it off.
then fill the side tank (expanson tank) 1/2
i watch the tank for 2 days. to get out all air. in the system.
if my dash coolant gauge, shows odd readings, at any time.
say it is not constant rise to 200f , I know I have air in the system.
If true, i use burping techniques,, ASK !
All mech's know about this....
also putting a thermostat in wrong will trap air.
the stat as a bleed hole that MUST be up hill side.
or will trap air.

now I answered for you and 1billion other water cooled engine owners.

Posted on Sep 15, 2013

6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 39 Answers

SOURCE: Water leak from top of expansion tank.2000 BMW 316i se

The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck

Posted on Apr 03, 2009

  • 39 Answers

SOURCE: Water leaking from top of expansion tank.

have you replaced the bleeder screws? and the expansion tank cap they both have O-rings that compress and will fail over time also check the hose at the top of the exp tank it also has o-rings inside it

Posted on Apr 03, 2009

  • 50 Answers

SOURCE: Coolant Problems

Hi there. It sounds like you have done the most obvious checks and I can assure you by-passing the heater core will have no effect. There are three possible causes that you need to investigate further and you will need specialist equipment for it - you either have a hair-line crack in the head or cylinder wall or it might be that the head bolts are stretched and therefore weakened and so need replacement. To help you identify these aforementioned possible problems, you might need a specialist fluid that you put into the cooling system which changes colour when combustion chamber pressure enters the cooling system, you need to contact your local Ford Dealer for this - but then you still have the three possible problems to deal with - cracked cylinder wall/s, cracked head or stretched head bolts. Hope this helps, Scottech.

Posted on Jun 17, 2009

  • 299 Answers

SOURCE: How to drain and refill coolant in a 2004 Jeep 3.7L Liberty?

you drain it from the radiator petcock on the bottom and you fill it from the overflow tank however I seem to remember those cars as having a radiator cap if i'm not mistaken it is on the passenger side if not in is the overflow tank

Posted on Sep 23, 2009

  • 173 Answers

SOURCE: Car overheating, Cadillac Deville

maybe it is cloged up. also check the fans. and the thermastat. and temp sensor.

Posted on Mar 26, 2010

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