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Old 06-06-2016, 02:32 PM   #1
watut
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E36 coolant leak



Need some help here, my 328 has a random coolant leak out of the upper rad hose. It only happens after it's been parked for a couple hours (ie. overnight). Some days won't see anything, some days a drop, some days fist sized puddle.

Radiator, Water Pump, Thermostat, Hoses are all new. Can this be a bad radiator cap?

Last edited by watut; 06-06-2016 at 02:37 PM.
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Old 06-06-2016, 02:45 PM   #2
Blackedout95
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Pressure test it, replace as needed.
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Old 06-06-2016, 10:15 PM   #3
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Quote:
Originally Posted by Blackedout95 View Post
Pressure test it, replace as needed.
What he said
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Old 06-06-2016, 11:36 PM   #4
watut
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I have already pressure tested the system and had no leaks.
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Old 06-07-2016, 11:06 AM   #5
Blackedout95
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I have already pressure tested the system and had no leaks.
You sure? That is why you think cap?

Pressure test it and walk away for 30 minutes plus and see. Sometimes the leak is so small and in a spot that may leak high up on res. that it only occurs primarily when hot/flow. In that case get in a quiet place, add pressure and put your ear to the top of the res. and listen for a hissing.
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Old 06-07-2016, 12:57 PM   #6
watut
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Quote:
Originally Posted by Blackedout95 View Post
You sure? That is why you think cap?

Pressure test it and walk away for 30 minutes plus and see. Sometimes the leak is so small and in a spot that may leak high up on res. that it only occurs primarily when hot/flow. In that case get in a quiet place, add pressure and put your ear to the top of the res. and listen for a hissing.
The leak isn't coming from the reservoir side, it's coming from the upper rad hose on the opposite side. If I come out in the morning (sometimes) I will see coolant on the ground and a trail of coolant down the radiator under the hose.

I had a mechanic friend pressure test it 2 weeks ago and it didn't leak. We re-seated the clamp on the hose, thinking that may be the problem. It didn't leak for 2 weeks then came back. I will try it again and leave it on for longer.

Last edited by watut; 06-07-2016 at 01:03 PM.
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Old 06-07-2016, 01:10 PM   #7
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Oh ok I see, thought the res was giving issue.

Yes pressure test, leave it on longer and see if pressure drops several psi (even if no leak showing ), if so there is air escaping some where. Be sure pressure tester attachment is tight or air can escape there during test.
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