Post
by dave_aber » Mon Feb 13, 2012 12:21 pm
OK, if your temp gauge doesn't move, and your heaters are cold it does sound like the theromstat has been removed. When this is done, it's actually just the middle that's removed, as the outer edge is needed to hold the rubber seal.
So, as you have had this van only 2 weeks, is it safe to assume that it has never heated up and the gauge has never moved since you have owned it?
And the place which sold it told you the lack of gauge movement was down to a faulty sensor?
Still not wanting to sound like a prophet of doom, but the only reason to remove the thermostat is to hide a bigger problem with the engine. If an engine overheats and cracks develop in the head, they sometimes form in such a way that they only open up when hot. So, by removing the thermostat you prevent the engine from getting up to temperature, and the crack(s) don't open up - and everything works OK, up to a point. You are running cold all the time, which will use more diesel than usual - and Bongo's use plenty anyway. You also never have any heat for demisting or keeping warm. (Just like a VW camper!)
I would be pressing the garage where it came from to get the sensor fitted, and show you it working and coming up to temperature. If the thermostat has been removed, it won't come up to temperature, even with a new sensor. (Note - when replacing the sensor, or the thermostat, the coolant system needs to be bled, properly). Once they replace the thermostat, you may find that it will overheat. At that point, it's back in their hands to fix the problem.
Hope it doesn't come to that though.

...
There are 10 types of people in this world.
Those that understand
binary, and those that don't.