Citroen ZX (1992 - 1998) - 1993 1901 ZXtd Heater Failure & Over Heating

Honest John Back Room » Technical matters
View Threaded
Sun 20 Apr 2008 13:08
1993 1901 ZXtd Heater Failure & Over Heating - twynham
The heater on my ZX has just stopped blowing hot air.
I have seen the previous posts regarding heater matrix failure but I have no leaks in the cockpit or engine compartment.
Also, the cooling system is overheating very quickly which I have not seen mentioned on the other posts.
Am I looking at a new matrix and all that involves or is there a blockage in the system?
If the latter, advice on shifting it would be gratefully received.

Edited by Pugugly on 20/04/2008 at 13:11

Reply | Report as offensive | Link
Sun 20 Apr 2008 16:08
1993 1901 ZXtd Heater Failure & Over Heating - Peter.N.
You may find that the two are connected. Overheating and lack of heat from the heater would suggest loss of circulation somewhere. Firstly, are you sure that there is no air in the cooling system, have you tried bleeding it? Overheating is usually caused by a faulty thermostat but if its covered a fairly high mileage it could be due to a partially blocked radiator, the only real cure being a new one. Feel the top of radiator after starting the engine, it should remain cold until the engine reaches normal temperature then will suddenly get hot as the thermostat opens. If it does this but still overheats, a radiator will probably be needed. It would help to know under what circumstances it overheats - in traffic, at speed, idling? Could be that the fan is not working or possibly the water pump although I have never had one fail on an XUD engine.
Reply | Report as offensive | Link
Mon 21 Apr 2008 14:09
1993 1901 ZXtd Heater Failure & Over Heating - twynham
Hi Peter. N.,
Thanks for that, it looks like it's the thermostat which is a big relief.
Cheers,
Les.
Reply | Report as offensive | Link
Wed 23 Apr 2008 20:42
1993 1901 ZXtd Heater Failure & Over Heating - aimcarthur
Whatever you do they do not let it overheat for long (i.e in the red) or you will end up replacing the / weakening the head gasket for sure.
Reply | Report as offensive | Link

Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.

The Good Garage Guide

From which small car to buy at which price point to the best UK-built cars, our Top 10s have the lot. Click now for your shortlist.

Unsure of what to buy? Our Top 10s are here to help you....