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phyllis huffman Posted on Jul 15, 2017
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I have an 05 GMC Envoy SLT and recently it started leaking transmission fluid out of the over flow pipe. Thought cooler in radiator wasn't cooling, so I replaced but still leaks. what can be wrong?

1 Answer

Marvin

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  • GMC Master 85,242 Answers
  • Posted on Jul 15, 2017
Marvin
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If you mean the vent pipe on the top of the tranny case then the transmission is overheating due to most likely slipping clutch packs.

Testimonial: "Transmission changes gears smooth! Never has been a problem. If it was clutch packs were going I would notice."

  • Marvin
    Marvin Jul 15, 2017

    No not necessarily. Friction is what causes the heat so what else would create enough heat, consult a local transmission repair shop, but bet you will need to rebuild the transmission.

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5 Related Answers

Anonymous

  • 5158 Answers
  • Posted on Apr 19, 2009

SOURCE: 88 Jeep Cherokee Transmission Fluid Leak

you need to tighten those fittings with a wrench... if they still leak... remove them and wrap them with a couple turns of "teflon tape" the kind they use for plumbing. the clamps you should use are hose clamps of the same type that you use for radiator hoses... you will note these can be tightened with a socket.... you really don't need to over tighten them but fairly snug... transmission fluid has quite alot of pressure.

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Harvey N Tawatao

  • 3854 Answers
  • Posted on Jun 12, 2009

SOURCE: oil leak after radiator change

The radiator has a transmission and engine oil cooler lines to it too. One of the oil lines are leaking, if you know which one that's have the battle. I believe the transmission line is on the passenger sides and the oil cooler line is on the drivers side. Look at where the lines connect to the radiator and see if there is signs of the leak. You may need to spray it down with brake cleaner if you not sure if it's a new leak or old leak from the accident. Good luck and hope this helps. And what do you mean by rear case gasket?? You mean the gasket that connects the transmission to the transfer case, or the rear O ring yoke gasket.

Anonymous

  • 386 Answers
  • Posted on Aug 06, 2009

SOURCE: Both low beam headlights on my 05 GMC envoy do not

Check your headlamp relays under the hood, should be located on either the L/H or R/H fender well , could be inside a black plastic box labled fuses and relays... there will be a label on the underside of the lid to this box locate the relays as per lables... please rate my help thanks...

jmgldsmth

Jim Goldsmith

  • 2005 Answers
  • Posted on Jul 22, 2010

SOURCE: 2004 gmc envoy leaking power steering fluid and

replace the leaking power steering hose

Anonymous

  • 14 Answers
  • Posted on May 25, 2011

SOURCE: transmission fluid & radiator fluid

Your transmission fluid runs to your cooling system to cool the transmission oil. So, in answer to your question, one of the two transmission lines (one in, bottom and one out, top) could be leaking from the cooling system.

Bring your vehicle in for a cooling system pressure check. Another thing to keep in mind when inspecting leaks is that where you see the leak may not necessarily be where the leak is from. While the leak will drip down, the wind from when you're driving will splatter the leak all over the under-carriage of your vehicle making it look like leaks are happening where they in fact, are not.

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Related Questions:

0helpful
1answer

SLT 4.2l 2wd. Where do the two vacuum lines go from the top of transmission?

no such thing , vents yes, ATF line yes , vacuum no.
wires yes.
only super old transmissions use vacuum modulators
let me guess you see to hoses an assume vacuum?
the metal in pair is tranny cooles
the service manual covers this.
2003 GMC Envoy 4,2 2wd'
gas 4L60E TRANSMisson shifts by TCM computer, totally.
no vacuum modulator there ever.
learn to follow line the other direction to the cooler (2 kinds)

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How is coolant fluid leaking into my transmission?

The auto transmissions have lines to the radiator, the core might have cracked and leaks to the transmission line that flows to and from it.
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I need to replace my transmission cooler lines on my 1995 GMC Jimmy is there just the bolts that hold them to the transmission and radiator or do I have to lift up on the motor or is there clamps ?

All of the transmission fluid can leak out. The cooling lines are there to cool the tranny fluid, and it is circulated through the radiator by means of a pump. If a line is leaking, the pump will just empty the fluid out through the leak. The lines are usually just held in place by clamps to keep them from chafing through against the body or chassis, so replacing them should be quite an easy job. Just undo the bolts that hold them to the box and the radiator, undo however many clamps hold them in place, and reverse the procedure with new pipes.
1helpful
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Transmission oil and radiator coolant is creamy

probably have a leaking transmission cooler in the radiator assembly, this would explain why the two fluids are mixing, replace radiator and flush cooling system, and then have transmission flushed and serviced to remove contaminated coolant from transmission
1helpful
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Transmission slipping on 03 GMC Envoy. what does iy mean when trans fluid measure high on dip stick?

Two things: #1 someone has overfilled it by mistake thinking they were putting oil in the engine. Yes I have seen this.
#2 The transmission cooler in the radiator could be leaking antifreeze into the transmission through the cooling line raising the fluid level. I would look for milk shake foam on the dip stick and make sure you check trans in park and not neutral.
2helpful
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Transmission oil in the radiator

If the radiator has tranny fluid mixed in with the coolant, then you have an internal tranny cooler leak. At the one side of the tranny, in the saddle tank, there is a tube. This tube allows hot tranny fluid to enter the rad and be cooled before returning to the transmission. It should be totally isolated and submerged in the coolant tank. Occasionally they can leak, and the two fluids will mix. You will need a new rad to repair the problem. It would also be recommended to have the tranny fluid and the coolant flushed after wards. Oil of any kind does not mix well with coolant, and could cause future damage to the tranny more so than the engine.
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Why is the transmisson fluid leaking by the engine fan

YOU HAVE A COOLER LINE LEAKING EITHER THE STEEL LINE OR RUBBER HOSE THAT GOES FROM THE TRANS TO THE RADIATOR IF YOU HAVE THE RUBBER LINE LEAKING DO NOT USE FUEL LINE TO REPAIR IT AS IT WILL BLOW OUT WITHIN MONTHS USE HYDRALIC LINE
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Transmision fluid in radiator fluid

Flush cooling system , and get transmission flushed & fluid and filter changed as well. Then install new radiator. Hopefully you caught it before damage to transmission.
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