Question about 1999 GMC Yukon

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Radiator leak Leak seem to come from radiator drivers side. There is a pipe that runs into the top of the radiator I believe the fluid is leaking through there...and iseas on how to fix or what is the worse case scenario0

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The hose that attaches the upper pipe on the driver side could be crack over the clamp could be loose. Loosen the clamp completely and remove the hose from the radiator. Check the hose for cracks and if there are any replace the whole hose. If not, replace the clamp. Remove the old clamp and get a new one that is the exact size or very similar. place the clamp on the hose, install hose back to radiator and tighten. If this does not solve your problem have the vehicle checked out by the certified automotive technicain.

Posted on Aug 31, 2008

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Hi Moreno, The transmission oil is cooled inside the radiator. There is a pipe which runs inside the radiator allowing the cooling. I believe the leakage your vehicle has is from the connection to one of those two pipes. It should not be very difficult to rectify. Regards John

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You are leaking transmission fluid from either the fluid cooling lines that run from transmission to a separate reservoir in the radiator, or leaking from the reservoir itself. Hopefully, it's only the lines and may just need tightening to stop the leak.
There are two lines to the radiator's reservoir. One brings fluid from transmission to the reservoir, and a return line back into the transmission. Probably located on driver's side of the radiator, one will be near top of radiator, and one near the bottom. Small copper or steel lines that may also turn into rubber lines. Clean the area well with rags to locate the leak. Will probably need to have the car running to make it leak, while looking for it. You could also take a wrench and try tightening the fittings at the radiator, and tighten any rubber hose clamps that you see. If it's not the lines or hoses that are leaking, then the radiator may need to be pulled off for repairs or replacement. But 9 times out of ten, it is a leak from one of the lines.
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Transmission fluid & radiator fluid keeps getting low. know approx. where leak is, drivers side front on inside of front tire. would a leak in radiator cause trans. fluid to leak also from radiator?...


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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My son's 1997 honda accord starting smelling hot, like something burning. He saw the temperature gauge was getting hot, so he pulled into a parking lot and opened the hood, there was steam coming out from...


I have had a similar problem with my son's Accord. You are lucky that your son knew to stop immediately, this happened to my son and we ended up having the head rebuilt.

A leak may exist but not show up until there is adequate pressure or, you may have a blockage that caused excessive pressure.

We once had the radiator leak which was nearly undetectable in his Accord, check for moisture in the trough where the radiator sits by looking down the inboard side of the radiator with the hood up. You may need a flashlight. Radiators are available at auto parts stores for about $100 and easy to replace. Replace the thermostat, cap and as many hoses as you can at the same time.

Another problem we had was the radiator cap had come apart and leaked periodically.

If the thermostat stuck, this could have caused a temperature and pressure surge explaining the now-you-see-it-now-you-don't leak. A faulty fan, or fan switch could also cause a periodic temperature surge.

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