Transmission cooling line

jonathonm529

Hello everybody, I have a 99 mercury mystique 2.0 4cyl automatic. recently when I left my house my friend noticed that I had a leak coming from the front of my car. Upon further inspection we found that both the feed and return line going from my radiator to my transmission had rusted through and I was leaking transmission fluid. I've searched just about everywhere online and I cannot find a specific transmission cooling line assembly part. I was on the other hand able to find many trans oil cooler line connectors and rubber hosing. I was curious if anyone could give me a part number for an actual part or if I should go ahead and buy the line connectors and rubber hosing

Mr_Shiftright

You're in a tough spot. Finding the hard steel lines for an old Mercury isn't going to be easy. I suppose you could check with the dealer and see if any such thing is available--if it is, it won't be cheap.

You can't use regular hose. Automatic transmission lines can generate 250 psi of pressure (or more). You need something like triple-wall hose or braided stainless flex hose---here again, not cheap.

You could have new lines made up. There are specialty houses that make up brake lines, etc. What you would do is bring them your old lines as a template.

Last possibility would be a wrecking yard, if you can find any lines that are decent and that won't be damaged during removal.

jonathonm529

Yeah I wasn't expecting it to be such a simple or cheap fix. Any how Mr_Shiftright I appreciate the advice. I'll just have to figure something out from one of those options.

Mr_Shiftright

I *think* that there are also "transmission line repair kits"---maybe I saw them on hot rod websites---in any event, worth some digging.

What you can't do is use ordinary gas or PCV line. It can't take the pressures and really, you don't want floppy lines underneath the car jeopardizing your transmission.

do you have hard line going right into the radiator cooler or is there some flex hose somewhere?

thecardoc3

Cooling line pressure is much lower than operational pressure. There are a lot of vehicles that use hoses with just spring clamps to secure them as transmission lines. If you want to use metal, that can be done too but we would make the replacements by hand if preformed replacements aren't available or reasonable.

Mr_Shiftright

50 psi in the cooling lines, something like that. If it had metal, I'd use metal. Engineers know what they're doing.