c6 transmission overheated
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From: NE Washington State
c6 transmission overheated
While plowing last winter my 1985 f250 c6 transmission overheated. I'm in process of flushing all old fluid and checking cooling system. After draining the pan and torque converter I'm trying to clear out the tranny cooling lines to the radiator. The return line blew out fine, but line from tranny to upper radiator connection will not clear. Do I have a blocked line, or is there some valve that prevents fluid moving from radiator to tranny? Thanks a bunch!! Chuck M.
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Cross-Country
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From: NE Washington State
Mark,
Thanks for the quick reply! Not what I wanted to hear, but that may be the cause of my overheating issue. Back underneath for me. At least it is not winter.
Chuck M.
Thanks for the quick reply! Not what I wanted to hear, but that may be the cause of my overheating issue. Back underneath for me. At least it is not winter.
Chuck M.
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Cross-Country
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From: NE Washington State
Mark and all others,
This thread is not dead yet. Disconnected both cooling lines at trans. and neither line is blocked. What else would prevent air from going into the trans thru the output line?
Thanks again,
Chuck M.
This thread is not dead yet. Disconnected both cooling lines at trans. and neither line is blocked. What else would prevent air from going into the trans thru the output line?
Thanks again,
Chuck M.
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From: Virginia
I thought you were blowing from the tranny connection through to the radiator and through the radiator and then through the other line with it disconnected from the tranny. Not sure you can blow into the transmission itself.
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Cross-Country
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From: NE Washington State
Dave;
Thanks for your reply.
I was attempting to clear both lines by blowing from radiator end to Trans. The return line allowed air passage but not the trans. output line. This was with the lines connected to the trans. With the trans. ends removed I find that the lines themselves are not blocked. My original question was weather there was a valve in the trans. that stopped flow into the trans. in that line. .I am assuming that upper radiator connection / forward trans. connection is the trans. output and that the lower radiator / rear trans. connection is the return line.
Thanks again for your assistance.
Chuck M.
Thanks for your reply.
I was attempting to clear both lines by blowing from radiator end to Trans. The return line allowed air passage but not the trans. output line. This was with the lines connected to the trans. With the trans. ends removed I find that the lines themselves are not blocked. My original question was weather there was a valve in the trans. that stopped flow into the trans. in that line. .I am assuming that upper radiator connection / forward trans. connection is the trans. output and that the lower radiator / rear trans. connection is the return line.
Thanks again for your assistance.
Chuck M.
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From: Virginia
You have to wait for the expert trans guy to answer your question, but I would be surprised if you could blow back through the output line of the trans, knowing what I know about hydraulics.
I am thinking you are good on the factory cooler. I bet if you button it back up and put new fluid in it, all will be well again. I had one of these on a old truck I had, I towed with it and after that it started acting up and shifting funny. I checked the fluid and it was brown. Like you I pulled the pan and filter, and drained the torque converter. I seem to remember it took almost 13 quarts. It went back to shifting normal after that. Then I towed with it again and the same thing happened. This time I changed the fluid, and also bought a small aftermarket trans cooler and mounted it on front of the radiator. It straightened out again and then I never had a problem with it towing after I put the cooler on it.
I am thinking you are good on the factory cooler. I bet if you button it back up and put new fluid in it, all will be well again. I had one of these on a old truck I had, I towed with it and after that it started acting up and shifting funny. I checked the fluid and it was brown. Like you I pulled the pan and filter, and drained the torque converter. I seem to remember it took almost 13 quarts. It went back to shifting normal after that. Then I towed with it again and the same thing happened. This time I changed the fluid, and also bought a small aftermarket trans cooler and mounted it on front of the radiator. It straightened out again and then I never had a problem with it towing after I put the cooler on it.
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From: NE Washington State
Thanks again,
I was thinking that the output line was for output only. I know now that the lines themselves are clear and not an issue. I am going to add an aux. cooler next week. Replaced the thermostat. It was a 195 and didn't open until 210 and then only opened a crack. Not sure it was bad but a cheap change since I already had it out.
Thanks again,
Chuck M.
I was thinking that the output line was for output only. I know now that the lines themselves are clear and not an issue. I am going to add an aux. cooler next week. Replaced the thermostat. It was a 195 and didn't open until 210 and then only opened a crack. Not sure it was bad but a cheap change since I already had it out.
Thanks again,
Chuck M.
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From: Angier, NC
If both lines blow clear did you also blow the radiator cooler out as the plug could be there?
As a guess why you cant blow back into the trans out put is the pump in the trans.
It had to pump the ATF and to do so at high PSI it would have to be tight.
That is just a guess on my part as I never tried to blow into the trans on either port.
Dave ----
As a guess why you cant blow back into the trans out put is the pump in the trans.
It had to pump the ATF and to do so at high PSI it would have to be tight.
That is just a guess on my part as I never tried to blow into the trans on either port.
Dave ----
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From: NE Washington State
Hi Dave,
Thanks for responding. I did not blow the radiator out, but did test using a method from a local town mechanic. Fill the radiator from the bottom up while blocking the fill spot (I just used a rag) When full, pull the block out and check how much flow when draining. Mine shot out about a 6 inch stream. He said if there were clogs inside the water would just dribble out. Made sense to me so I think the radiator is ok. Also I don't believe this is original radiator. The drain was plastic and on passenger side. My manual says it would be on the drivers side and i think 38 years ago the valve would have been metal.
The reason I was trying to blow back thru the tranny was I really didn't want to disconnect the line at the tranny. Very hard to get to on my rig, but I ended up doing it anyway.
Thanks again for your help,
Chuck M.
Thanks for responding. I did not blow the radiator out, but did test using a method from a local town mechanic. Fill the radiator from the bottom up while blocking the fill spot (I just used a rag) When full, pull the block out and check how much flow when draining. Mine shot out about a 6 inch stream. He said if there were clogs inside the water would just dribble out. Made sense to me so I think the radiator is ok. Also I don't believe this is original radiator. The drain was plastic and on passenger side. My manual says it would be on the drivers side and i think 38 years ago the valve would have been metal.
The reason I was trying to blow back thru the tranny was I really didn't want to disconnect the line at the tranny. Very hard to get to on my rig, but I ended up doing it anyway.
Thanks again for your help,
Chuck M.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
Cool radiator test, but how does that relate to the transmission cooler inside the radiator?
The return side of the cooler loop is at the rear of the trans. There is a small orifice there to restrict the flow, it is not wide open so it won't flow like there is no restriction.
The return side of the cooler loop is at the rear of the trans. There is a small orifice there to restrict the flow, it is not wide open so it won't flow like there is no restriction.
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From: NE Washington State
Mark,
Duh! My bad. I miss-read the question as blowing out the radiator fins not the cooling lines thru the radiator. One of the first things I did was blow out the lines going thru the radiator. All clear. Thanks for the info about line location on tranny. I did think the rear location was return line, but wasn't positive.
Chuck M.
Duh! My bad. I miss-read the question as blowing out the radiator fins not the cooling lines thru the radiator. One of the first things I did was blow out the lines going thru the radiator. All clear. Thanks for the info about line location on tranny. I did think the rear location was return line, but wasn't positive.
Chuck M.
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