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Old 01-03-2016, 09:40 AM
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New water pump caused radiator leak

I recently had some issues with a water pump replacement on my 2007 Jeep Jk unlimited rubicon.

I typically do this type of work myself. I wound up going to a local shop to get the work done as the OEM pump and 3rd party options seemed crappy or too expensive composited to the cost / part (metal impeller), and I just didn't have the time. I made sure they knew my 07 wrangler needed HOAT coolant and I even left bottles inside my truck of the correct coolant in case they didn't have it.

Got the job done: two days later the upper radiator tube popped off the connection. I reattached the tube and returned to the shop to get it looked at and refilled with coolant. They blamed it on a old spring clip and replaced it with a hose clamp.

Next day: stoped at a store and noticed coolant spewing out of my radiator. The seam on the right side had split open and was leaking lots of coolant. Brought it back to the shop. They claimed that the new water pump increased the pressure and cause the radiator to fail. It was the original radiator with 120k miles. I was still thinking that something else must of cause the failure.

I saw them using coolant that wasn't orange. They claimed that the HOAT coolant is dofferent colors for each manufacture and a dye is added after to make it orange. They promised that the correct coolant was used.

What else could cause a radiator to fail after a new water pump? It didn't have any leaks prior to this. I had to spend a extra 340$ to get the new radiator put in.

She's burning oil (1qt per 1000 miles), needs a new cat (CEL is on, poorly functioning cat is the code) and now the throw out bearing in my transmission is making a lot of noise. I guess pretty standard stuff for a 07 with 120k on her.

Does anyone think the shop used the wrong coolant or screwed something else up?

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Old 03-02-2016, 10:45 AM
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Re: New water pump caused radiator leak

The only thing that would cause the pressure in the cooling system to go up enough to pop the hose off and the top of the radiator off, is a different radiator cap that is rated way too high. Check what the radiator cap is actually rated at and what is is actually popping off at with a radiator cap pressure tester. Don't trust what is stamped on the cap. It is supposed to keep the system at max SAFE pressure to prevent things from blowing apart.
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Old 03-03-2016, 06:59 AM
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Re: New water pump caused radiator leak

+1 Radiator cap.


IMHO, when you're doing any major work on the coolant system, it always pays to replace the cap with a good quality new one.
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Old 03-03-2016, 09:34 AM
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Re: New water pump caused radiator leak

Quote:
Originally Posted by WaltA View Post
+1 Radiator cap.


IMHO, when you're doing any major work on the coolant system, it always pays to replace the cap with a good quality new one.
I 100% agree!! BUT I have had bad caps right out of the box, either too high of pressure or too low. You can't just trust the people in China put the right spring on the right cap. Test every cap. I always use NAPA parts and even there, I have had brand new items right of the box that didn't work as they are supposed to.

IMHO, there is NO WAY a new water pump can build up enough pressure to blow hoses off and blow top radiator tanks off. The cap would be the first thing I check.
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