I was wondering if it was common for the lower radiator hose to leak with a Koyo. I noticed a drip coming out...well it's more like a small stream. I tried to adjust the clamp and radiator fluid started to leak on me. I ran through my stuff and found a screw type hose clamp and tossed that on. Looked like the problem was solved so I ran to grab dinner and when I came home I noticed a trail of coolant as I was reversing into the driveway. So before I go and take off the undertray again has anyone had any issues with stock radiator hoses on a Koyo application? I thought the two clamps would hold it. Guess I was wrong.

 

I have not heard of problems like this solely due to the change in radiators.

I assume that you re-used the original hose. If so, it probably took a set (deformed permanently due to it's previous use), and is now having difficulty sealing under the new conditions (slightly different clamp positions, maybe slightly different tube diameter, etc.).

The best solution would be a new hose. However, if you remove the old hose, you may find debris stuck to its inside and if you clean it thoroughly, it may seal.

Another trick I've learned is to lightly lubricate the inside of the (screw-type) clamp with silicone grease to let it slide a bit on the hose while it is tightened. This helps avoid deforming the hose at the clamp screw area, causing a leak.

Also make sure the tubes you are clamping to (both ends) are clean and round.

 

These cars are getting old and require maintenance on wear items such as rad hoses. Do yourself a favor and replace that hose and as many others that are original. Its been 15 years. It is time.

I also suggest using the OEM hose clamps. They don't damage hoses like the screw type worm clamps and provide the correct torque levels.

 

No problem with mine---used new OEM hoses and clamps since the ones on the car were 15 years old.Hopefully the new ones will last as long,by which time I shall be 80 yrs old and won't care.

 

I replaced all the coolant hoses in early 2005 for the same reason. Good preventive maintenance.

Dave

 

I replaced all my hoses in 07. I was was thinking it might have been deformed, but thought I might be able to get away with it. Oh well thanks, just wanted to make sure it wasn't a common problem that needed a special hose or something like that! Thanks again guys...

 

^ Yeah. Aside from general age/wear and tear I'd say it's not a common problem (I've had three coolant hoses go in the last year or so). Just replace the two main rad hoses with silicone ones and all the misc little coolant hoses with fresh hosing. You should be good to go =)

 

what if someone were to go with high test silicone hoses instead of oem?? i was told i should get constant torque clamps for my samcos (cause of them flexing so much)