Coolant Cap

[ledzilla]

So, today I had the Marauder idling in the driveway while putzing around. After maybe 15 minutes or so, come back to see a river of coolant and the temp gauge getting awfully close to the danger zone. **** it down, pop the hood, take a look... The reservoir cap is leaking. It's not even the original cap, which was replaced some odd years ago for the same reason with an OEM part. This cap has probably only seen a few thousand miles put on the car since it was installed. So, should I just be expecting to have to replace the coolant reservoir cap every few years, or is there a replacement that will actually last for awhile?

[Agent2006]

I'm going with: its not the cap...the car is overheating for some reason...stuck thermostat , head gasket, fan not running....some other issue

[fastblackmerc]

Probably the cap.

[jgc61sr2002]

Purchased a new cap at local Ford dealer when mine was leaking.
It was a stock item.

[TORINO]

A bad cap would make it leak coolant but not overheat. Thermostat is original ? also looking at the coolant is it also original ? both things do not last forever. Would be a good place to start before you are stuck somewhere other than the driveway. Any thermostat can stick at anytime but usually just fails to open on warm up one day, driving or idling.

[fastblackmerc]

I run this in my Marauder.

https://www.reischeperformance.com/F4Ddata.html

[Mr. Man]

Presently not looking at a cap but before you get a new one check the gasket(assuming it has one) for tears. Also check the tank sealing surface for a chip or some sort of damage that could let fluid pass.

[ledzilla]

A bad cap would make it leak coolant but not overheat. Thermostat is original ? also looking at the coolant is it also original ? both things do not last forever. Would be a good place to start before you are stuck somewhere other than the driveway. Any thermostat can stick at anytime but usually just fails to open on warm up one day, driving or idling.

It was leaking a lot of coolant, as in there was a small river of it running across the driveway. But no, not original coolant, not original thermostat. Probably due for coolant replacement anyway, even so, not too much liking it pouring out from underneath the cap as a prompting event.

[ledzilla]

Purchased a new cap at local Ford dealer when mine was leaking.
It was a stock item.

Yeah, I'm just really annoyed given that this is the second cap, and didn't last nearly as long as the original.

[ledzilla]

I run this in my Marauder.

https://www.reischeperformance.com/F4Ddata.html

Would that also help with the poor cooling in the rear of the driver side cylinder head? I had a mod kit for letting the coolant actually flow through, but for the life of me I can never get to installing it.

[ledzilla]

Presently not looking at a cap but before you get a new one check the gasket(assuming it has one) for tears. Also check the tank sealing surface for a chip or some sort of damage that could let fluid pass.

Yeah, I've been meaning to pop it off to inspect it, but I haven't taken another look at it, and it was all too hot at the time.

[fastblackmerc]

Would that also help with the poor cooling in the rear of the driver side cylinder head? I had a mod kit for letting the coolant actually flow through, but for the life of me I can never get to installing it.

No it would not help with the cooling issue at the drivers side head. The only way to fix that is to install a rear head cooling kit.

[ledzilla]

No it would not help with the cooling issue at the drivers side head. The only way to fix that is to install a rear head cooling kit.

That's what I thought, but can't blame a guy for hoping it might help a little, right?