Sciencescience

Tue Jan 29, 2019, 11:09 AM

Where did Aquila go?

Its been Friday since he has posted a hydrogen car post

I hope he is OK

11 replies, 357 views

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Arrow 11 replies Author Time Post
Reply Where did Aquila go? (Original post)
oflguy Jan 2019 OP
foia Jan 2019 #1
MumblyPeg Jan 2019 #2
oflguy Jan 2019 #3
rampartb Jan 2019 #4
oflguy Jan 2019 #5
rampartb Jan 2019 #6
oflguy Jan 2019 #7
rampartb Jan 2019 #8
oflguy Jan 2019 #9
rampartb Jan 2019 #10
oflguy Jan 2019 #11

Response to oflguy (Original post)

Tue Jan 29, 2019, 11:15 AM

1. Abducted by aliens in a spaceship fueled by hydrogen cells?

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Response to oflguy (Original post)

Tue Jan 29, 2019, 11:41 AM

2. kidnapped by government big oil lobbyists?

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Response to MumblyPeg (Reply #2)

Tue Jan 29, 2019, 11:55 AM

3. You guys just gave me my laugh for the day

Thanks

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Response to oflguy (Original post)

Tue Jan 29, 2019, 12:03 PM

4. say, ofl. can you recommend an auto a/c specialist?

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Response to rampartb (Reply #4)

Tue Jan 29, 2019, 12:08 PM

5. I can't say I know one from another, sorry

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Response to oflguy (Reply #5)

Tue Jan 29, 2019, 12:16 PM

6. no problem

i can probably go a few more weeks without fixing it.

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Response to rampartb (Reply #6)

Tue Jan 29, 2019, 12:24 PM

7. Is this the first time you have had trouble with it?

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Response to oflguy (Reply #7)

Tue Jan 29, 2019, 12:48 PM

8. no. it wotked ok for a few weeks last summer

after adding a little freon.

this old van is a 2004. i've been having trouble with the dashboard wiring (which may include a thermostat for the a/c? ) might be about time for a new one ........

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Response to rampartb (Reply #8)

Tue Jan 29, 2019, 01:02 PM

9. If it has a refrigerant leak

I wouldn't spend money to just put more in, unless the leak is found and fixed.

I once had a caravan that developed a leak in the evaporator coil under the dashboard. The fix was too expensive and I wasn't about to tear out the dash to replace or fix it. I sold the car.


Most of the time, leaks in coils happen in the little "U" joints that are soldered on the exterior of the coil tubes to join one tube to another. These days, all the ones I've seen are aluminum. Aluminum is very difficult to solder, especially since the tubing is paper-thin. You can burn a hole through it easily, so nobody wants to try to fix one. Instead, they recommend replacing the whole coil, which is the best idea.


I don't even know what type of refrigerant they use these days in cars or if there is a leak detector that can sniff it so as to determine where it is. Maybe someone in the forum knows.

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Response to oflguy (Reply #9)

Tue Jan 29, 2019, 01:33 PM

10. i leaves a yellow color where it leaks

in theory anyway. i sure can't find it.

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Response to rampartb (Reply #10)

Tue Jan 29, 2019, 01:45 PM

11. Usually a trace of oil will accumulate at the leak

A small bit of oil circulates with the refrigerant and will remain at the leak while the refrigerant will evaporate. The most effective way to find a refrigerant leak is with a sniffer that has the capability to be desensitized once the general area of the leak is detected.


Another method is to put some soapy water in a spray bottle and saturate the lines and all joints. A relatively large leak will show up immediately as large bubbles. Small leaks can be detected after several minutes since tiny bubbles will form at the leak. Don't forget to saturate all the joints on the compressor.


A good strategy is to use a sniffer to find the general area, then pinpoint the leak with a spray bottle.


A blue liquid in a blue plastic dispenser called "Leak Lock" is a good product to use on the threads if you are tightening a flare or pipe fitting. Just be careful not to get any inside the line. Any refrigeration supply house should sell you a tube.

A tip if you see quite a bit of oil from the engine on refrigerant lines is to remove it with some electronic contact cleaner in a spray bottle. A spray from a can will "dry off" the residue so a potential leak can be detected more easily.


One more thing. If the system is empty or almost empty and air could have been sucked into it on the low pressure side, the system needs to be evacuated with a vacuum pump so that all moisture in the lines is removed. If somebody fixes the leak and says an empty system does not need to be evacuated, take the vehicle to a competent technician and have it done.

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