Ok, i'm on my third coolant tank cap in the last six months, i don't drive my disco that much so i'm wondering if i have other issue's. Temp gauge always goes to the normal position once at temp and never seems to get hot, Pressure build up? I changed my thermo stat a while ago, let it run for a long time with cap off to get air out. Any idea's?

 

I dont understand the question...What's wrong exactly?

 

No apostrophe's needed for plural's.

Aside from that, how do they fail?

 

Right front wheel bearing is bad.

 

LOL! 2nd the wheel bearing...

 

1st off.. you do not, and cannot bleed the air out of that thing by letting it idle with the coolant cap off. tons, and i mean tons of thread on how to bleed the cooling system.

elevate the expansion tank.
remove expansion tank cap.
remove bleeder screw.. do not lose or break this thing.
pour coolant into the expansion tank untill you have passed a good amount of coolant out of the bleeder screw. tighten bleeder screw.. do not overtighten it. it will break.
fill expansion tank to about the seam on the tank, tighten cap.

as for failure of the cap.. your coolant system my be becoming overpressurized. a few reasons for that.

 

How does he even know it's over pressurized? The only complaint I see in the original post is that "It never gets Hot." Still not sure what we're discussing here.

 

me either. i didnt get past "idled the truck with the cap off to get air out"

fern, you also need to understand "normal" on the ridiculous temperature thing in the dash.. is 130* - 250*. stupid thing is horribly inaccurate.

 

I will look up the bleeder valve, thanks. As far as the coolant tank cap it does have a relief valve in it. As far as the jackass replies.....thanks for the help! Lol

 

At least 3 people have asked you what the failure mode was, and you've declined to answer. In those circumstances, how much help do you think you're going to get?