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  #31  
Old 12-30-2014, 02:37 PM
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Originally Posted by vstech View Post
Water does not compress. What you are noticing is the water being pushed into crevasses in the block, and rubber hoses expanding to handle more volume.
I'd put money on the Bernoulli effect.

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  #32  
Old 12-30-2014, 03:38 PM
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Originally Posted by moon161 View Post
I'd put money on the Bernoulli effect.
The phenomenon of internal pressure reduction with increased stream velocity in a fluid.

Hmm. I don't see how this affects the level of the coolant...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
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  #33  
Old 12-30-2014, 07:57 PM
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Originally Posted by funola View Post
I don't get why you have to drill a hole in the radiator cap to put a funnel in???

To get a seal. The hole in the cap has a grommet in it. Otherwise the water will seep out of the funnel.

They actually used to sell the caps. Probably not anymore in California.
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  #34  
Old 12-31-2014, 10:32 AM
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Originally Posted by Lucas View Post
To get a seal. The hole in the cap has a grommet in it. Otherwise the water will seep out of the funnel.

They actually used to sell the caps. Probably not anymore in California.
I still don't understand why you need to drill a hole in the cap to use the funnel and why you need a seal. You are using the funnel to fill the expansion tank? You are not using it to do a pressure test?
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  #35  
Old 12-31-2014, 12:04 PM
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I think he is filling the funnel to the brim, and sealing the small end to the radiator cap... then running the car to let the water pump force all the air out, with the funnel forcing coolant in.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #36  
Old 12-31-2014, 01:07 PM
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I think he is filling the funnel to the brim, and sealing the small end to the radiator cap... then running the car to let the water pump force all the air out, with the funnel forcing coolant in.

Yup. But I didn't realize you guys don't have a cap on the radiator.
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  #37  
Old 12-31-2014, 01:22 PM
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Yup. But I didn't realize you guys don't have a cap on the radiator.
Some older 240D's have a radiator cap and no expansion tank. The cap is at the highest point of the system. I still don't see the need to seal a funnel to the cap. Just fill it to the brim of the radiator or the expansion tank and as the engine warms and you rev the engine to create more flow, trapped air will rise to the cap and coolant level will drop and you just add more coolant. What am I missing? Why do unnecessary work drilling a hole in the cap which won't seal anyway unless you RTV it?
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  #38  
Old 12-31-2014, 01:32 PM
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I have a funnel somewhere for this purpose, its got a rubber sleeve on its neck and a valve to open and cut flow, Very useful for bleeding FWD V6 engines on toyota/nissan/honda etc. The funnel sits in the narrow opening of the radiator cap hole and the rubber takes up the sealing duties.

I bought it a long time ago, dont remember what it was actually called.
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  #39  
Old 12-31-2014, 01:34 PM
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Changed coolant now engine overheats

Yeah. That totally works. It's more for working on cars for hire. Don't want a customer coming back saying the coolant is low. For me it's the aspect of getting it done and being done. The guy that taught me is the type to go all out.

The caps have a rubber grommet in it. I'm on the road but can shoot s pic once I get home in a few days.

I didn't drill one. They sell a kit with universal caps.

Originally I thought in the situation of the OP, it would be a solution. Sounded easier than putting a car on Ramps, messing with hoses, etc. But I realize now there is no cap.

Last edited by Lucas; 12-31-2014 at 01:55 PM.
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  #40  
Old 12-31-2014, 01:40 PM
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For the guy that wants to feel like a pro

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  #41  
Old 12-31-2014, 02:30 PM
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For the guy that wants to feel like a pro

Spill free funnel with radiator caps! After the air is burped out but the level in the funnel is higher than the cap and you take the funnel out, that's when it spills! I still don't see the need for one of these.
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  #42  
Old 12-31-2014, 02:33 PM
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Originally Posted by Lucas View Post
Yeah. That totally works. It's more for working on cars for hire. Don't want a customer coming back saying the coolant is low. For me it's the aspect of getting it done and being done. The guy that taught me is the type to go all out.

The caps have a rubber grommet in it. I'm on the road but can shoot s pic once I get home in a few days.

I didn't drill one. They sell a kit with universal caps.

Originally I thought in the situation of the OP, it would be a solution. Sounded easier than putting a car on Ramps, messing with hoses, etc. But I realize now there is no cap.
there is a cap...
it's just not on the radiator... it's on the expansion tank.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #43  
Old 12-31-2014, 03:02 PM
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Originally Posted by funola View Post
Spill free funnel with radiator caps! After the air is burped out but the level in the funnel is higher than the cap and you take the funnel out, that's when it spills! I still don't see the need for one of these.

Put water in the funnel, no big deal.

Or as the other poster said he has one with a valve.

If you are really good, there won't be anything left in the funnel

This is what any good shop will do. Or should do. Or take the time to run it and fill to "specified capacity."

If the radiator had a cap, it would be much easier than monkeying around with ramps and hoses.

I'm not sure if it would work on an expansion tank. Seems like it would overfill.
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  #44  
Old 12-31-2014, 03:42 PM
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Originally Posted by funola View Post
Spill free funnel with radiator caps! After the air is burped out but the level in the funnel is higher than the cap and you take the funnel out, that's when it spills! I still don't see the need for one of these.
Talk about pointless...drive it a few minutes, top it off, and you're fine for months. But hang on to this silly thing...it may be helpful for when your prostate betrays you.
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  #45  
Old 12-31-2014, 06:18 PM
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Lol. You guys crack me up.

My pops drive me nuts with his ways. However, for his birthday I got him one of those snap on front end wrenches. Like gigantic channel locks mixed with vise grips. He uses it for everything.

For the OP with an air bubble and overheating, I thought it might help. I apologize for the suggestion.

When I saw my buddy use one, I was like "seriously dude?" This truck is completely dented and missing lights and bumpers.

But I used it when I services all the farmers market trucks during winter. When doing 5 coolant flushes at once, it was nice to burp one out and start draining the next. Saving time.

To each their own. That's the beauty of western civilization.

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