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Old 12-28-2017, 07:07 AM   #1
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Default coolant leak

Hello,
I've had my 1995 nissan hb for about a month now, and it has been leaking coolant since I've gotten it. It's a slow leak, hasn't overheated yet, I fill the coolant every 2-3 days or so just to be safe. It seems to be coming from the lower area on the left side. Are there any common coolant problems for these trucks or could this be a major issue? I'm hoping it's just some hoses and not the water pump or something....
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Old 12-28-2017, 07:59 AM   #2
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Left side as in the driver's side or the passenger side when looking at the engine? First I would check the oil dipstick to make sure there's no coolant in the oil. Both of the radiator hoses and pretty much all of the other coolant hoses run on that side of the engine bay. The water pump and thermostat aren't a big deal at all to get to either. Is the leak right in front or further back?
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Old 12-28-2017, 03:06 PM   #3
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Quote:
Originally Posted by SBJ View Post
Left side as in the driver's side or the passenger side when looking at the engine? First I would check the oil dipstick to make sure there's no coolant in the oil. Both of the radiator hoses and pretty much all of the other coolant hoses run on that side of the engine bay. The water pump and thermostat aren't a big deal at all to get to either. Is the leak right in front or further back?
This.

Clean off the engine real well, confirm where the leak actually is. Get a loaner tool radiator cap pressure kit and pump up, can help find the leak. Or pay a shop to find/confirm leak, then you can decide whether you or the shop fixes this.

Yes, you need to fix this, as an overheat will cost way more and do way more damage.
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Old 12-28-2017, 11:52 PM   #4
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Would that be driver side or passenger side?

V-6 or 4 cyl engine?
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Old 12-29-2017, 08:13 AM   #5
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the easiest way to find the leak is pour some UV dye in the radiator. oreilly auto sells the dye and the UV pen.

my lexus started loosing coolant. i wasnt seeing it anywhere, but i could smell it when the car was started. i poured the dye in the system, drove it two mornings, then i shined the light around.

i recently replaced the heater hoses and heater control valve. the hoses were seeping at the firewall where they connected to the heater core. that is the bad thing about using worm gear style hose clamps. they have to be retightened now and then. i did not put them on there too tight. they are in a bad spot and the last thing i want to do is pinch the heater core fittings.
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Old 01-01-2018, 10:24 AM   #6
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Thanks for the replies everyone, sorry for the delayed response I've been working a lot. Thanks for the UV dye suggestion, Cadillac . I'm going to go get some Tuesday when I'm off work.

The leak is on the passenger side, it is a 4 cycle. The leak is also right in front. I might also add that it tends to leak much faster, almost pouring, as soon as I turn off the truck then stops. This makes me think it's a little more complex than just hoses but I'm still hoping that's all it is (wishful thinking). I'll keep this thread updated as I figure it out

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Old 01-01-2018, 04:34 PM   #7
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Quote:
Originally Posted by Squidbaby View Post
The leak is on the passenger side, it is a 4 cycle. The leak is also right in front. I might also add that it tends to leak much faster, almost pouring, as soon as I turn off the truck then stops. This makes me think it's a little more complex than just hoses but I'm still hoping that's all it is (wishful thinking). I'll keep this thread updated as I figure it out
Not uncommon for leaks to be more after shutting off the engine, the engine causes the coolant to heat up as no longer being circulated (once found a pinhole in a GM coolant hose this way, by looking again AFTER it sat for 10 minutes)

I've got 1998 and 2004 4-cylinder Frontiers and those have the water pump and thermostat both on front passenger side of the engine, and I suspect leak is from one or both of those. The water pumps and thermostats are not especially tough to R&R on mine, assume that yours is similar.

I had a water pump on my 1998 that did not leak a drop until I took the alternator belt off to change my alternator !
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Old 01-01-2018, 04:45 PM   #8
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does leak appear under the truck kind of inline with the radiator or further back? If inline with the radiator, check the lower hose clamp first, if loose, try to tighten it, check to see if the hose feels spongy, it's not uncommon on these older trucks for the plastic nipples on the radiator to crack or break.
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