can't get heat

[tony 340]

06 lariat with climate control

Once truck is warmed up all the way 190+ I get great heat.

Before that I only get heat while on the throttle.

I warm it up every morning for 5 minutes or more and it still barely defrosts until I'm on the gas. As soon as I let off the gas it wants to stop giving me warm air and goes back to cold air.

In the summertime AC works just fine.

This is my second winter of this and I'd like to fix it.

Is this a vacuum issue?

Any idea where a common vacuum leak might be?

[JER-1]

Originally Posted by tony 340

06 lariat with climate control

Once truck is warmed up all the way 190+ I get great heat.

Before that I only get heat while on the throttle.

I warm it up every morning for 5 minutes or more and it still barely defrosts until I'm on the gas. As soon as I let off the gas it wants to stop giving me warm air and goes back to cold air.

In the summertime AC works just fine.

This is my second winter of this and I'd like to fix it.

Is this a vacuum issue?

Any idea where a common vacuum leak might be?

I don't beleive our deisels have vacuum
JER-1

[F350R]

You do have a vacuum pump its located on the fender well on the passenger side. I don't get a lot of heat, mostly none on the way home although its mostly down hill for ten miles and roughly 800ft drop in elevation. On the way to work its up hill which generates a decent amount of heat. With it being 3 degrees right now the ride home tonight is going to be cold even with the cold front on it will still be a cold ride. There are various places on site where we can plug in that will help some.

[Davey~do]

Check yer water pump for good flow.

[strokepower]

Mine does the same thing.. I just put a piece of cardboard between the intercooler and the radiator all winter.. Seems to help a bit.. Maybe it's a mind thing... interested in more info on it.. I was thinking maybe head gaskets? Leaking coolant equals low coolant equals hear not blowing hot... Or is that wrong?

[tony 340]

Even in park, after warmed up and driven to work. Oil and coolant 190+.

As soon as I get in park, the heat goes right away.

If I hold the throttle at 2K the heat comes right back.

This has to be a vacuum leak.

[f250Triton]

Did you check the gray vacuum line on the passenger side just above the valve cover you should see the heater hose with a vacuum actuator inline. There is a gray vacuum hose that should connect to it. If that isnt hooked up, there's your problem. haha

[dhanna6powerstroke]

Originally Posted by f250Triton

Did you check the gray vacuum line on the passenger side just above the valve cover you should see the heater hose with a vacuum actuator inline. There is a gray vacuum hose that should connect to it. If that isnt hooked up, there's your problem. haha

That grey hose won't keep you from having heat. It will however keep your vent controls from working right since it's a vacuum leak. That grey hose controls the valve for MAX A/C operation.

[strokepower]

Originally Posted by tony 340

Even in park, after warmed up and driven to work. Oil and coolant 190+.

As soon as I get in park, the heat goes right away.

If I hold the throttle at 2K the heat comes right back.

This has to be a vacuum leak.

2000-2300 is where mine works best.. Sounds like we have the exact same problem.. It's really annoying...

[f250Triton]

Originally Posted by dhanna6powerstroke

That grey hose won't keep you from having heat. It will however keep your vent controls from working right since it's a vacuum leak. That grey hose controls the valve for MAX A/C operation.

Pretty sure it will effect heating.