Jag engine-d later "modern" rover tstat issue - Defender Source
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  #1  
Old January 19th, 2016, 10:11 AM
Roverlab
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Trevor Griffiths
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Jag engine-d later "modern" rover tstat issue

Anybody who has worked with the 06-09 Rangies, Sports, and LR3's with P0128 temp faults, how often have you seen failed oil thermostats? I had one that I finally resolved last week- admittedly I was chasing a lack of heat and repeated P0128 issues for a few months on this car, not knowing there was an oil thermostat-and saw an internal o-ring failure. Just wondering if I should consider making a a more pro-active effort to replace this when the cooling system is opened up for other repairs....
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  #2  
Old January 19th, 2016, 12:36 PM
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Can't say that it was repetitive because I sold it at 73k but mine failed at 4 years and 46k miles on my 05. The rubber seal had peeled off the disc on a couple points.
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Old January 19th, 2016, 02:42 PM
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Trevor Griffiths
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Ryan, do you mean the oil thermostat or the coolant thermostat? The car I had in had a failure in the oil thermostat much the same way the coolant thermostat- a rubber seal dislodged. Very familiar with the the coolant stat failure, but this is the first oil cooler stat.....
With the effort involved in draining down coolant for an upper stat or stat housing replacement, and how tedious the air bleeding can be, I just wonder- if others have seen oil stat problems-if it would make sense to just replace that at the same time, especially with x miles and/or y years....
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Old January 19th, 2016, 02:52 PM
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Neill Thornton
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I have never heard of a 4.4 oil stat failure until now. Coolant thermostats, and the plastic bleed assembly are common.
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Old January 19th, 2016, 03:08 PM
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Never seen or heard of that failure. Also, if you aren't using a vacuum filler, you are wasting your time. A vacuum filler was probably the best tool I've bought over the years.
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Old January 19th, 2016, 03:23 PM
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Trevor Griffiths
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I've been using Airlift, and always plan to keep the car until it's had one heat and cool cycle after the initial fill. Jimmy, what do you use?
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Old January 19th, 2016, 03:47 PM
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Trevor Griffiths
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For reference, the symptoms with this car were much more noticeable in cold ambient. The temperature gauge would often not move above a 1/3 of the gauge after 10/20 miles of driving; P0128 would be a pending fault often before the engine came up near temperature; cabin heat would be weak with slight improvement in rpm/road speed.
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Old January 19th, 2016, 06:43 PM
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I have this, but if I were buying another one I would get this because you can drain the cooling system and keep vacuum on it while doing the repair without making a mess on the ground. I don't even test drive some cars depending on the traffic in the city.
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Old January 25th, 2016, 08:42 AM
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Here's a pic of the oil stat failure
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