Heater core swap

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tvanstee

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This is good help, I think I'm going to first try the airlift and see if I can pull any airlocks out of the system. My rear heat is operating in a similar way with not blowing unless I'm revving above idle, could be just an air lock. I did some work on the head gaskets last year so had to drain the system. Possible there has been an air lock this whole time.

Fingers crossed
 

Tapps33

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The only other question that comes to mind is, “when’s the last time you replaced the water pump?” There could be an issue there as well.
 

tvanstee

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Replaced with a new water pump when I did head gaskets. In theory that should be all good. I just ordered that airlift kit to see if it's going to be an airlock.

I love this LR4 but it's by far the most involved I've ever needed to be with a vehicle. At this point it's a hobby just to keep it running at spec.
 

Tapps33

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Replaced with a new water pump when I did head gaskets. In theory that should be all good. I just ordered that airlift kit to see if it's going to be an airlock.

I love this LR4 but it's by far the most involved I've ever needed to be with a vehicle. At this point it's a hobby just to keep it running at spec.

Yeah, if I’m being honest, when they’re good, they’re great! But it seems like they tend to have the “waterfall” of problems issue….until you finally get it all good. Then you get a little bit of peace and quiet….until the next thing. Even my Dodge truck didn’t require as much attention!
 

tvanstee

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Just wrapped this project up. I bought the OEM model of the coolant vacuum tool.
I pulled the lower rad hose off and drained the system, although I was surprised at how little fluid came out. Only about 4-5 litres. Put it all back together and pulled a vacuum. Held at -24 psi without a hint of losing that for a good 45 min to an hour. Opened the fill line and within about 3 min the system was full. Neat to see those totally flat coolant hoses slowly rise up.
I then fired it up to let it warm and then sat at 2000 rpms for 8 minutes. At the end of that all blowers were pushing out hot air. And seemed to keep doing that after a little drive about.

Fingers crossed I have full heat next time I drive around.
 

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