KJM93

My upper radiator hose keeps coming off after driving the car around for a while, which then my coolant drains out of the radiator. I am going to replace the hose that keeps coming off but what could this be? I recently got my timing belt replaced (230k miles), water pump, idler pullies, thermostat, and serpentine belt as well as a coolant flush at a toyota/lexus independent facility. I bled/burped the system and was able to make it home no issues. When I was in idle, the heater wasn't blowing hot but the minute I started driving it was hot. When I got home i checked if the hose came off but it looked fine. Any advice helps!

IanB2

Is the upper rad hose outlet damaged? Hose damaged? Hose clamp missing? That's not right, obviously.

chuyrobles

It is likely the hose clamp has lost its tension grip; the shop likely re-used the old ones. If it is the typical oem spring clamp, they lose their tension when removing them. You probably don't need to remove the hose to install a standard worm drive clamp. There may be enough room to slide the current clamp forward, out of the way, and open the worm drive clamp to install over the hose.

I never re-use the spring style oem radiator hose clamps. I replace with worm drive clamps. You do need to check the tension after several engine turn-on cycles.

KJM93

Hey guys thanks for the replies, I actually just swapped out the OEM clamps with worm drive clamps and now I have no issue.

hughow

strongly disagree! In my shop always but always use spring clamps, never hose clamps. It is easy to over or under tighten hose clamps. Hose clamps are fine on metal radiator necks which disappeared decades ago. spring clamps apply the exact tension that Toyota engineers intended. I always reuse the spring clamps. New ones are expensive and they don't lose their tension.