Coolant smell/leak - Ram Promaster Forum
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post #1 of 33 Old 05-23-2019, 03:57 PM Thread Starter
MF Construction
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Coolant smell/leak

Update on my ongoing coolant smell/leak that I've had since around 5000 miles. My Promaster currently has 12,000 miles and is at my dealer for warranty service work including the following:
1. Leaking water onto the engine at the center seam on the cowl. Dealer say this is normal.
2. Driver side mirror glass flutters around above 50 mph. Dealer replaced the whole mirror we will see if it's fixed. Pass side is fine...
3. Coolant smell and or leak, I have a constant coolant smell near the nose and the bottle drops slowly over a month. Dealer says there are no leaks, and no pressure loss in the system.

Last edited by MF Construction; 05-23-2019 at 06:19 PM.
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post #2 of 33 Old 05-23-2019, 05:21 PM
nebulight
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Garage
Welcome to Promaster ownership. I can't find a leak or evidence of a leak, yet the smell is there. I'm not super mechanical, but even had my shop take a look while getting an oil change and they didn't notice anything either.

Current caretaker of the Backroader 159" wb
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post #3 of 33 Old 05-23-2019, 06:18 PM Thread Starter
MF Construction
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I told the dealer to put another tech on it and check it again. In a sealed system the coolant level in the bottle shouldn't drop. It drops slowly over a month so that means it's going somewhere! It's either burning it internally but I never smell coolant in the exhaust, or the plastic radiator has a hairline crack and it's steaming out? You can clearly smell coolant when standing in front of my van after it's running for awhile. Never see any coolant leaks or drips anywhere...
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post #4 of 33 Old 05-23-2019, 06:31 PM
phil
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A poster reported that the hose to thermostat connection was weeping on him, had residue around the leak area.
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post #5 of 33 Old 05-23-2019, 06:40 PM Thread Starter
MF Construction
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Quote:
Originally Posted by phil View Post
A poster reported that the hose to thermostat connection was weeping on him, had residue around the leak area.
Obrians post? I did read that. Maybe I should tell the dealer to look on the ProMaster forums...
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post #6 of 33 Old 05-23-2019, 06:54 PM
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I brought the Promaster in for a coolant leak check as well.
Dealer said the van passed the pressure check, no leak.
But I smell it outside near the front, sometimes pretty strong.

'18 Promaster 1500 HR gasser, bare bones, Working on it
98 Ram 3500 Cummins 12v diesel
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post #7 of 33 Old 05-23-2019, 09:38 PM
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My son swears he can smell coolant outside in front of mine. But I don't. And the fluid level is very stable in the tank. I'll just leave it be.
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post #8 of 33 Old 05-23-2019, 09:53 PM
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I think the main culprit is where the tank is crimped onto the core. a bottle of Barrs leak will fix the problem. The dealer will only drive you nuts
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post #9 of 33 Old 05-23-2019, 10:01 PM
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I caught, pure luck, that in really cold weather the lower hose would allow seepage at engine block, noticed the starter oozing umnn starter fluid, err... no... coolant.. .

I doubled the clamps, left OEM crimped clamp(s) on and sistered in worm gear style beside them and zero problems since.. .

================

2014 Diesel 2500 window wagon
Michelin 245x75x16 Defenders
11 June 2015 delivery
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post #10 of 33 Old 05-24-2019, 10:41 AM
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It might be hard to see but try looking up from the passenger side. Remove the splash shield down there so you can see. The leak is probably up high that's why the coolant level only goes down a certain amount. And why you probably don't see and drips. Look for a pinkish residue at your hose clamps. I also had my thermostat housing blow apart on the hwy, lol maybe a separate issue. I'd post a pic but I'm over my limit😤
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