Small coolant leak, need input
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Mountain Pass
Joined: May 2015
Posts: 128
Likes: 8
From: Cottonwood, California
Small coolant leak, need input
I have a small coolant leak coming from the passenger side near the back of the engine that forms a spot about the size of a dinner plate if it sits for a few days.
One thing I noticed is if I turn off the AC selector switch when I park I will get the drip but if I leave the switch on MAX AC when I shut the truck off I do not get any leaking.
It is definitely coolant and not just the condensation from use of the AC.
If I haven't used the truck for a few days or if I have run it with the AC off I will get the drips.
If I run with the AC on and leave the switch in the on position when I shut the truck off it won't leak.
I have tried to locate it from looking above and below but can't determine where it is coming from.
Any thoughts?
One thing I noticed is if I turn off the AC selector switch when I park I will get the drip but if I leave the switch on MAX AC when I shut the truck off I do not get any leaking.
It is definitely coolant and not just the condensation from use of the AC.
If I haven't used the truck for a few days or if I have run it with the AC off I will get the drips.
If I run with the AC on and leave the switch in the on position when I shut the truck off it won't leak.
I have tried to locate it from looking above and below but can't determine where it is coming from.
Any thoughts?
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Sounds like a leak in the heater core return to the degas resevoir. Check the Y connection and hose under the degas and the hose where it connects on the firewall cross over pipe (near the FICM).
Oops edit. I thought I read driver side.
For passenger side check the heater core control valve. They are prone to leak. It has the grey vacuum line going to it.
Oops edit. I thought I read driver side.
For passenger side check the heater core control valve. They are prone to leak. It has the grey vacuum line going to it.
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