No heat

[milkyy]

08 montana no heat on idle, but plenty once driving also no heat thru rear heater at all changed themostat in june, any ideas?

 

[Steelcity]

First some easy checks , low on antifreeze ? air in system? These vans are a pain to bleed .

 

[melsg5]

I agree with the air in the system caused by a leak or the thermostat change

 

[milkyy]

If there is air in system wouldn't the van overheat ?

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[melsg5]

have seen this before without overheating, so I take it temperature gauge is not either too hight or too low?

 

[milkyy]

Gauge stays right in the middle

 

[melsg5]

Open the bleed to see if there is air in the system.

 

[milkyy]

Where is the bleeder

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[melsg5]

You changed the thermostat and did not bleed the system? You should see a valve on the thermostat housing.

https://www.youtube.com/watch?v=gHVG1gKQw3k

 

[milkyy]

Thanks, but the video shows a 3.4 and the 08 has a 3.9 and the thermostat housing doesn't have a bleeder, it must be somwhere else and i cant find it, if you can tell me where to look i'd find it most helpful.

 

[Nananooknak]

Possibly self bleeding.just spit balling.your heater core is plugged or a hose is bad.check the return hose to your radiator it should be hot.

 

[melsg5]

The 3.9 has no bleed valve. On a cold engine is the coolant level about 1" above the seam on the tank? If not add coolant and let it cycle a few times till it maintains that level of coolant when cold. If that is not the issue a clogged heater core would be the only thing left.

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[milkyy]

Thanks van had some air in system, it took some time but i got all air out all is ok now thanks

 

[milkyy]

a little air still in system, had system bled all ok now, thanks guys.

 

[Steelcity]

Yea they are a pain to bleed. Now I know why people don't do a drain and refill.