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Citroen zx heater/ thermostat question.

I have a number of probs with my zx.

The original problem was misting of the windscreen which was sorted by one of the radiator sealant (something like radweld). But now the heater seems to take ages to heat up, but the air temp is well below freezing atm.

My question is,

.... would a faulty thermostat affect the heater? ie would the heater work OK ( or even hotter) if the thermostat was not opening. It's just I thought the heater circuit was independant of the main rad circuit??

I've checked the thermostat which seems to open at around 90c.

Cheers

Reply to
nickc
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putting in radiator sealant will have blocked the fine tubes of the heater radiator. flushing out all the sealant and replacing the heater rad will fix the fault.

Reply to
Mrcheerful

Sounds like the thermostat is ok. does it have a temperature gauge and is that getting up to temperature? Are the pipes to the heater from the engine bay getting hot?

I suspect the radiator sealant has blocked your heater radiator. It may also block your main radiator and cause the engine to overheat. Sounds to me as if you need to replace the heater radiator but if you do so you should thoroughly flush the engine coolant, maybe even remove the main radiator to flush it with a hose pipe. Disconnect all of the coolant hoses and flush everything in sight to get rid of the sealant.

Do you normally run it with the correct level of antifreeze? If you know that the antifreeze also protects the system from rusting and the hoses perishing then I'm sorry to nag but some people think it's only for winter and just use water then wonder why their cooling system falls apart :-)

Reply to
rp

Thats because you've blocked it up with that radweld shit.

So the heater matrix is blocked up with radweld....

Reply to
Conor

No, there is still enough flow to give good heat.

It looks like a new stat has sorted it.

So why would a new stat increase heater temp??......anyone??

Oh yes, and the rad sealant shit has worked well ................ so far.

Reply to
nickc

By restricting the coolant flow on cold days, you get faster warm up (or

*any* on really cold days!) so there is now a small amount of hot coolant going through it instead of a large amount of cool coolant.
Reply to
PCPaul

Normally because the old one wasn't sealing.

Reply to
Duncan Wood

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