Over the last week or so i have noticed an issue with the heaters. The Vehicle gets up to temp (middle of the gauge) but the heaters blow cold, the heaters come hot if you work the engine hard or travel at 60 or so for a little while and they stay warm once on. There is water in the tank as i have checked this. I have ordered a new thermostat, any advice?
Disco 300 TDI Heater Problem
- Thread starter Mond2k
- Start date
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discool
Well-Known Member
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If the vehicle gets up to temp as and when it should u won't need a replacement thermostat.
As the heater matrix should be the same temp as the engine coolant either the coolant isnt flowing through the matrix as it should or the air flow dampers are locked into the cool air position.
As the heater matrix should be the same temp as the engine coolant either the coolant isnt flowing through the matrix as it should or the air flow dampers are locked into the cool air position.
discool
Well-Known Member
- Posts
- 13,609
Well it was cold this morning frost in my part of the world, perhaps your temp gauge is fibbing, or the engine temp sensor is, and your engine is running on the cool side tdi's do don't they, why not try tomorrow with a bit of cardboard over the grill to partly restrict the air flow see what happens, keeping a eye on the gauge of course.
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It did is on sunday also when ir was a warm day but only took mile to come through as i had the horse box on the back going up a hill. but soon as i left it for 20 min and got back in didnt get hot again for a while.
Sure once the temp gauge is warm previous the heaters have been warm.
Sure once the temp gauge is warm previous the heaters have been warm.
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- 10,639
- Location
- Oxfordshire
double check your paddles work.
could be blocked, try a hose and back flush it.
air lock?
touch both pipes when the engine is up to temp, are they both hot and pressurised?
just to check, your blower fan is spinning all the time?
could be blocked, try a hose and back flush it.
air lock?
touch both pipes when the engine is up to temp, are they both hot and pressurised?
just to check, your blower fan is spinning all the time?
- Posts
- 10,639
- Location
- Oxfordshire
- Posts
- 10,639
- Location
- Oxfordshire
low coolant is a 300tdi killer as the pump is high up, so sort it asap.
check all pipe connections and the rad for leakage signs.
weep hole under water pump and the p gasket is
look behind the pump and p gasket for signs of water.
check all pipe connections and the rad for leakage signs.
weep hole under water pump and the p gasket is
look behind the pump and p gasket for signs of water.
