Coolant leak

[Kalei]

2002 GMC 6.6L leaking coolant above oil filter where it bolts on.

 

[TheBac]

Since theres no real info given, it could be a lot of things, but probably oil cooler leaking. Get yourself under there, clean everything up, and start looking for where the leak is really coming from. Or take it to a shop that has coolant dye and UV light which would help find the leak.

 

[john.firth.161]

I had that issue on my LBZ and was cracked head

 

[TOMAN]

When the temp starts to change like summer to fall my oil cooler will leak for a week or 2 then stop till spring ? Has been doing this for 600,000 mile. I did changed the oil cooler and it dose the same thing ??? Seen this on a lot of trucks