At wit's end!!! :(

[Dereck]

Hi Porschpow

At wit's end!!!

Wits End is only a couple hours from me, how long you going to be there? Maybe we could meet up?

Regards

Dereck

[sly]

[porschpow]

ok, great. Can you , are you suppose to use rtv for:

intake (plenumnb gasket)
egr throttle body gasket?
fitting that connectsegr coolant hose to lower intake rear drivers side?

[sly]

nope... those all stay dry. General rule is gaskets get RTV if it's a liquid seal (oil/water) and air/exhaust stay dry.

[porschpow]

OK, so changed all the vacuum hoses under intake, changed egr coolant hoses, cleaned up and put new gasket for the egr coolant (didn't remove), and bam! done, doesn't leak to my visual, left the rad cap opened, burping air, did that for 20-30 minutes, still left cap off, and to my surprise (sarcastic), coolant was spilling over. WTF!!!!!!! I mean i have heat, pretty good, both heater hoses hot, coolant egr hoses hot, but no pressure. Shouldn't you be able to have coolant blasting out of filler neck, where the freak is the pressure, am i going nuts

[porschpow]

oops, i put a little rtvon the egr coolant throttle body gasket and intaske plenum, is this a bad thing?

[porschpow]

update pumped 15 psi in system, seeing no leaks and in 5-10 minutes i lost 3 psi

[porschpow]

My oil is good, coolant doesn't bubble or move around, i just have no pressure in the system. i checked all the hoses. I don't know where else to turn to

[jaywish]

1) When car is cold, fill rad with coolant.
Fill coolant bottle to cold line.
Replace cap.
Run car up to temp with heat on.
Run car in first gear for a block or so, to get air out.
Let cool completely.
check coolant bottle, if at cold line go to step 2. If below cold line repeat step 1.

2) Take note of exact level of coolant in overflow bottle.(use a flashlight)
Run the car in gear with heat off, until well hot.
Park car, shut off and monitor the overflow bottle.
unless it is cold out, the level in the bottle should rise temporarily above the cold line until the engine cools completely and sucks the fluid back in the bottle.
If this is what happens, everything is working correctly. It is the pressure that forced the coolant into the overflow bottle. Don't worry be happy and stop reading.


Though if it is really cold out the pressure in the engine side of the system may not build up enough pressure to exceed the rating of the pressure cap. In which case you will not see a rise in the coolant bottle.
When the engine is cold, check the level in the radiator. if the rad is full then everything is ok.
If you need more proof, when car is cold, remove cap.
Start motor let run in gear with heat off.
Eventually the rad will start to overflow. Shut off car.
Let cool, top off fluid and replace rad cap.

The fluid that came out is your proof. That shows that hot fluid expands. When it expands there are only two possibilities.
The first possibility is that no pressure is being built up because fluid exits the system. If this is the case you would constantly be loosing coolant.
The second possibility is that the hot fluid is trying to expand and the system is keeping it from expanding by building up pressure.
This pressure is normally contained by the radiator cap unless the pressure exceeds the cap rating, then the fluid goes into the overflow bottle temporarily.
When the coolant cools, it contracts, creating a vacuum which sucks the fluid back out of the bottle into the radiator & engine.

[porschpow]

lack of/non-existent coolant pressure

1) When car is cold, fill rad with coolant.
Fill coolant bottle to cold line.
Replace cap.
Run car up to temp with heat on.
Run car in first gear for a block or so, to get air out.
Let cool completely.
check coolant bottle, if at cold line go to step 2. If below cold line repeat step 1.

2) Take note of exact level of coolant in overflow bottle.(use a flashlight)
Run the car in gear with heat off, until well hot.
Park car, shut off and monitor the overflow bottle.
unless it is cold out, the level in the bottle should rise temporarily above the cold line until the engine cools completely and sucks the fluid back in the bottle.
If this is what happens, everything is working correctly. It is the pressure that forced the coolant into the overflow bottle. Don't worry be happy and stop reading.


Though if it is really cold out the pressure in the engine side of the system may not build up enough pressure to exceed the rating of the pressure cap. In which case you will not see a rise in the coolant bottle.
When the engine is cold, check the level in the radiator. if the rad is full then everything is ok.
If you need more proof, when car is cold, remove cap.
Start motor let run in gear with heat off.
Eventually the rad will start to overflow. Shut off car.
Let cool, top off fluid and replace rad cap.

The fluid that came out is your proof. That shows that hot fluid expands. When it expands there are only two possibilities.
The first possibility is that no pressure is being built up because fluid exits the system. If this is the case you would constantly be loosing coolant.
The second possibility is that the hot fluid is trying to expand and the system is keeping it from expanding by building up pressure.
This pressure is normally contained by the radiator cap unless the pressure exceeds the cap rating, then the fluid goes into the overflow bottle temporarily.
When the coolant cools, it contracts, creating a vacuum which sucks the fluid back out of the bottle into the radiator & engine.

I did that, i burped the system Jay. Even with motor running highway use, i parked the car and with car running i took off the radiator cap, coolant wasn't overflowing and i see the coolant level is full and the resevoir/overflow tank is on the cold level, not hot. I see there was a little movement in the radiator. I had an ir temp gun, the temp of the radiator filler cap area was 90 degrees, the upper radiator hose was 160 and by the thermostat 190. the top of the engine intake manifold was 160.

I didn't notice the overflow resvoir tank coolant level increasing or decreasing

I am seriously out of ideas. No clue what is going on

[jaywish]

You have to take the cap off with the engine cold. It should be full to the top. Then run the car in gear, heater off. The coolant will overflow . (Unless it is really cold out)

[porschpow]

it was 48-57 degrees out today, the coolant wasn't overflowingthe heater was off. the coolant just was staying at the same level, wasn't overflowing

[sly]

oops, i put a little rtvon the egr coolant throttle body gasket and intaske plenum, is this a bad thing?

not really, but if you ever have to remove them... don't be surprised if it makes a royal mess and you have to spend a few hours cleaning the surfaces.

[porschpow]

yeah this is true.

its already been done. thanks

I am just getting fed up with this coolant pressure thing

[gadget73]

if its not losing coolant and you have heat, don't worry about it.