Forum:
hi can anyone help me with a heating problem i have on a hijet 1.3 EFI dual fuel van i have just bought.
the temp guage is sitting just over half way, but after about 25 miles i can hear bubbling, the bubbling is the water going into the expansion bottle,… which it fill to the top.
then i have to empty the expansion bottle and top up the system again
i have put a cooling flush through the heating system, but the problem still exsists
ther is no sign of white gunge at the oil cap
hope some one can help, many thanks
heating
Hi all here is some information. Same problem on the 1000 cc The Metal pipe where the pressure cap is is different shape on the 1300 but the probs are the same. The bubbling you hear is because there too much air in the system and causing the bubbleing in the expansion tank. So heres what to check and do.
If you want give me a pm with your number I will ring you to explain, but
The main culprit IS the metal pipe where the pressure cap goes.
To check if the cooling system is working properly Fill the as recomened in the manual. Make sure you bleed the heater tank as in the manual.
Make sure the expansion tank level is between the max / min Note the level. Then go for a run.
What should happen as the pressure increases the water will be pushed into the expansion tank. After cooling and the pressure drops the water is pulled back into the system. It has to return back near to the same level. Lower no problems.
If the water level is higher then air has been sucked back into the system which causes the air lock. Then leads to the overheating.
Places to check. Rad Cap. Bleed cap on the heater tank. But the main culprit as we all know is where the pressure cap fits. If there is a pinhole gap it will suck air than water. Where it seals it must be 100% airtight.
Mine was rusty and very rough. even smoothing it off made no difference.
So tried to get a rplacement. New £150 Arghhhhhh!
But was then told they no longer have it in stock. Then I found a breakers called
Used Hijet Parts (Jeremy Thorne 01225 344481 mob 07734604021. Sent the pipe after he checked it over £20 posted.
And make sure your heater is
And make sure your heater is set to the hot position so it fills the heater matrix with water and does not air lock, a common mistake on all vehicles.