Front water pipe to radiator

[dazzerT251900td]

The hot water pipe coming from the engine surely must go into the top of the radiator. And the return cold pipe must come from the bottom of the radiator. My hot water pipe goes in the bottom of the radiator and the cold return pipe comes out the top. This can't be right can it ? My engine is an AAZ 1900 TD and runs hot anyway. Anybody any ideas.

Your help much appreciated.


Daz

[H-G]

The water should enter at the bottom of the Radiator to ensure that you get the full effect from the Radiator by forcing the hot water through the matrix. If it were to go in at the top, then most of the radiator would be full of air and not work effectively and the engine would overheat.

Hope this helps.

[dazzerT251900td]

The radiator is not full of air because its full of water. Surely it must enter the top hot, cool through the radiator back to the engine from the bottom. I'm sure all cars hot water enters the top of the radiators and comes back through the bottom colder.

Daz

[H-G]

Forgive me but if you are so sure why are you asking?

From my experience, all cars that I have worked on the hot water enters at the bottom of the radiator. If it were to enter at the top it will take the shortest route through the Radiator to the exit and back to the engine without traveling through the matrix and therefore will not be cooled effieciently.

Think of it like this; you take a shower, the shower tray/bath will
never fill up (unless the plug is full of gunk), now imagine the flow of water coming in through the plughole, the bath/showertray will fill until it either overflows or exits through the overflow hole. If the rad filled from the top, especially in a T25 as it has no filler cap, the radiator would never fill up, you would end up with an airlock and you engine will overheat as not enough of the coolent is not being cooled as it passes through the radiator.

Leave it to you to decide, however if you choose wrong, expect your next forum thread to be on the wanted page asking if anyone has a spare engine for sale.

Good luck.

[billy739]

https://club8090.co.uk/forum/viewtopic.php?p=7439875" onclick="window.open(this.href);return false;

looks like everyone can learn something today.....

in the top out the bottom

read the post , check the youtube video , type in cooling system flow into google .... all say in the top out the bottom!

[H-G]

Hi Billy,

Happy to hold my hands up if wrong and shot down in flames; just going on what I have seen in the past and how it was explained to me.

[dazzerT251900td]

Hi Billy,

Happy to hold my hands up if wrong and shot down in flames; just going on what I have seen in the past and how it was explained to me.

thanks lads for your help any way.i ve been looking at the radiator and both pipes go in near the bottom anyway,so i am not sure which one goes to the top,its just the engine gets hot and the water pipes are still cool as they leave the engine bay yet the pipes around the engine and reservoir tank is hot too.It takes about 15 minutes for my long water pipes under camper to feel any heat on them,yet the heater pipes to cab are hot,any ideas anyone thank you again for replys.

[H-G]

In fear of raising my head above the parapet once again.......

You may find that the heater pipes bypass the thermostat so they will get hot before the ones leading to the radiator; I would check mine, but I have just removed the pipes as I am in the middle of doing an AAZ conversion. My JX would not register any temp on the gauge if left to warm at idle and took a we while to warm when on a run; you may wish to check the thermostat; if that is not opening at the right temp than you won't get any of the hot water heading up to the radiator. If in doubt, perhaps consider changing the thermostat - if you look on the brickwerks pages under T3 Special Section, they suggest an 80 Degree thermostat.

My apologies if anything I wrote was misleading - that's how it was explained to me and it seems pretty logical, however following Billys' link make perfect sense (more so than the explanation I was give).

Regards

[dazzerT251900td]

yes ive just got a aaz in mine,they do run hot,iam going to fit a oil cooler,you ought to fit one now while you are fitting the engine.ive ordered mine from brickwerks hope its ok.i am fitting it myself,hope its go s ok.I ve got one pipe a little bit longer than the other at the radiator which loops over the frame,and one which goes straight into the radiator close by,the question is,which one goes to the top cheers again.daz

[H-G]

I will be fitting an oil cooler with mine along with the 80 Degree thermostat. Also going to see about a couple of scoops for the air intakes to force a bit more air into the engine bay. I am lead to believe that the Brickwerks kit is a very straight forward conversion and will be using the same one.

I have just looked at the pipes leading to my Rad and the inboard pipe goes to the bottom of the rad with the outboard pipe going into the back of the radiator.

[Fully Loaded Cali']

I was about to buy an oil cooler, but thought about it a bit....It only runs hot at speed, due to lack of air flow as engine in rear. When my AAZ was in the donor car it ran cool. So, i bought a piece of Ally 120mm dia tubing (the flexi type) and fitted it to pick up air flow from under the van (just rear of the drive shaft~) and the other end fits nicely onto the base of the oil filter. Hey presto, the van runs lovely and cool, temp needle sits nicely in the middle. And all for 7 quid

[H-G]

Now there's an idea but would use it to direct air to cool the turbo while on the move. The bit I like best about the oil cooler is that it will still cool the oil while stationary when the fan kick in; also, there is a brand new on on the broken van I have just bought with all the other shiney bits needed to speed the AAZ transplant up.

[dazzerT251900td]

good idea,and good luck on your new aaz engine into the campervan.hope all goes well.