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  #41  
Old January 3rd, 2014, 06:43 PM
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Jason England
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Originally Posted by JohnsD90 View Post
You can't mask bad head gaskets with a gutted or no thermostat, the coolant would still be leaking into the motor cause you to burn coolant. What no thermostat does is help make the dummy gauge not show the motor is running hot.
How do you know he's not losing coolant?

.. I had a minor leak on head gaskets that slowly took the water level down ... a small head gasket leak into the water system injects quite a bit of heat ... but removing the thermostat adds a hell of a lot of cooling.

I would make the assumption that nothing is correct until proven otherwise.

But I'm a glass half empty kinda person ... but given the thermostat was fully missing I don't think thats an unreasonable approach
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  #42  
Old January 3rd, 2014, 06:48 PM
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Originally Posted by leastonce View Post
when you say no issues ... what does the temp gauge indicate?



Because if it's not getting warm enough to put any heat into the cabin then it shouldn't be reading very much on the gauge .... equally at anything other than a snails pace it would drop right down to virtually nothing ... I know this because I had a thermostat fail open ...



running a cold engine would drink fuel as the ECU compensates by throwing in more fuel ...



do you have any codes on the ECU readout?

The gauge rose up to middle for the whole ride home at 70 MPH. Plenty of heat then.

This is a 200Tdi. No ECU. No readouts.
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  #43  
Old January 3rd, 2014, 06:59 PM
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Originally Posted by DannyboyUpstate View Post
The gauge rose up to middle for the whole ride home at 70 MPH. Plenty of heat then.

This is a 200Tdi. No ECU. No readouts.
you said earlier it barely gets a 1/4 way up the dial after running down the road for 20-30mins ... if that's correct and you also had plenty of heat at 70mph ... somethings not right with the engine and i'm guessing no thermostat is only the start!
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #44  
Old January 3rd, 2014, 07:13 PM
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Originally Posted by leastonce View Post
you said earlier it barely gets a 1/4 way up the dial after running down the road for 20-30mins ... if that's correct and you also had plenty of heat at 70mph ... somethings not right with the engine and i'm guessing no thermostat is only the start!

Yeah, around town, it's hard to get hot.

On the 3 hour highway trip with the engine screaming, it heated up to half, but it never got overheated.

This is all according to the craptastic gauge.
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  #45  
Old January 3rd, 2014, 07:19 PM
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John B.
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Be careful not to confuse V8 head gasket experience with a 200tdi.
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  #46  
Old January 3rd, 2014, 07:51 PM
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Be careful not to confuse V8 head gasket experience with a 200tdi.
yeah ,,, agreed ... but adding a thermostat will definitely not hurt things
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #47  
Old January 4th, 2014, 12:05 AM
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Have replaced at least 3 TDI head gaskets that would leak compression into the coolant, but no coolant in the oil or cylinders and no coolant leaks for a while.

In this scenario, the compression kept the engines cold around town, but warm on the highway.
It always seemed to me that this would have been opposite, but they stayed cool around town and got normal at first and as the head gasket continued to fail would overheat at high speeds.

The difference in heater output was amazing once the problem was fixed.
The temp would rise as quick as with any other vehicle with warm air abundant from the heater at any speed and at a stop.

You just have to love replacing a TDI head gasket and all those separate torqueings over a day or so with the degree wheel.

Have also installed 2 - 300 heads on 200TDI engines due to the thin "bridge" of material cast between the I & E valves on the 200TDI head that very often cracks. The bridge was widened on the 300 and compensated for with the wider offset of the 300TDI rockers (compared to the 200TDI).

When you get over the new owners joy run a compression check and see if you have a low cylinder. Best to take a reading cold and compare to one at operating temp. If a cylinder drops when at OT, you could have a cracked head.

Hope this helps... it's all theory before the head is off, then its all fact.
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  #48  
Old January 4th, 2014, 03:04 PM
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No Heat



ALL DAY after the new NAPA thermostat. We'll see what happens when it warms up now...

Also going to put a VDO gauge in. This thing is too Mickey Mouse.
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  #49  
Old January 4th, 2014, 03:51 PM
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Quote:
Originally Posted by DannyboyUpstate View Post
ALL DAY after the new NAPA thermostat. We'll see what happens when it warms up now... Also going to put a VDO gauge in. This thing is too Mickey Mouse.
i have a VDO and they aren't expensive. Even so that does look a bit on the high side. Does your radiator fan work?

Did you check the value stamped on the thermostat?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #50  
Old January 4th, 2014, 04:23 PM
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Quote:
Originally Posted by leastonce View Post
i have a VDO and they aren't expensive. Even so that does look a bit on the high side. Does your radiator fan work?

Did you check the value stamped on the thermostat?

195degF per NAPA.

------ Follow up post added January 4th, 2014 04:29 PM ------

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