Need help finding a coolant leak on my truck. There’s no evidence of a leak but the reservoir needs topping up every week or two. What’s more there is a sweet smell in the cab of coolant. I’m thinking heater core but the heat works pretty good so I’m wondering how to check that more accurately.

In other News while searching for a mysterious clunk clunk clunk that sounds to be coming from the drivetrain (has been there since i got the truck just finally have the tools to Jack it up and spin everything around) I’ve noticed the left rear brake/wheel assembly has grease or oil all over it. The brake lines look good so I’m wondering if the bearing is bad or if there’s a seal in the axle that’s leaking allowing diff fluid out the assembly?

I still haven’t figured out the clunk. Maybe it’s a shot bearing? Maybe the cv joints are bad. I checked the u joints and there’s no play there which is what i thought it was.