Stupid truck; what now?

[gabelnj]

So I just changed my oil, I go to turn on my ignition and the little air pump that sits over top the front right wheel in the engine compartment cycles on and doesn't turn off. I start the truck, run it around the hood, still running i turn it off check oil levels and then turn the ignition on again an that stupid little pump cycles on and will not shut off unless I un-plug it.
So what is this pump, what does it do, who wants to buy a truck.... I don't think it is my vacuum pump for my 4x4, i traced those lines back to another housing next to this pump????

[Tuscany]

It's the vacuum pump for your 4x4 and for your heater control valve. If it isn't turning off than you have a leak somewhere. Possibly the vacuum tank is cracked and leaking or the lines going to the 4x4 or the line is hanging off of the heater control valve.

[gabelnj]

Well a few years ago I disconnected the pump from the 4x4 and plugged it. Need new hub seals and vacuum line....

Interesting fact, two weeks ago I found some coolant under my truck. Not a significant loss and I have not been able to identify or recreate the leak. Think the two may be related.

This lead me to the oil change... no coolant in oil.

[Young-SC-Owner]

No, in no way can they be related. Look at your thermostat housing it's probably leaking


Sent from my iPhone using AutoGuide.com App

[twoicebergs]

Coolant loss, small amount but unidentified. Check all your connection points; sometimes they will leak under pressure. Of course, also check for minor puking.

[Tuscany]

They can in fact be related. The heater control valve has been known to leak and it is controlled by the vacuum from the vacuum pump.

[Young-SC-Owner]

But disconnecting the hubs from the vacuum system in no way affects the HCV.


Sent from my iPhone using AutoGuide.com App

[Young-SC-Owner]

The HCV leaks, regardless of vacuum on it, just to add


Sent from my iPhone using AutoGuide.com App

[Tuscany]

I'm talking about his coolant leak along with his vacuum pump problem.

[jimmie67]

ok!! My money pit is at it again!!! blowing white smoke and loosing coolant!!! Head Gasket? or is it egr related?? Ran into a guy the other day that said it was egr and that I needed to put in the egr block-off kit??