How/why is this?

 

driving slow. was parkt up in traffic for about 15 mins, not a warm day even.

 

lookt at temp gauge, was right up. steam coming out of bonnet etc.

 

drove 5 mins then stopped.

 

the Heaters were stone cold??? put a kettle of water init, trickled home.

 

there is no gunk around the oil cap? (head gasket symptom)

 

and the viscus fan is connected etc.

 

suggestions? iv got a mechanic having a look ina few days, just after some thaughts.

Sounds like you have a leak or something that's developed into an airlock.

Probably a leak,hence the heater being cold. make sure the guy pressure tests the system,can be hard to trace.

Heater matrix.

 

See if there is water in the passanger foot well.

 

Do asearch on it and you will get a lot of hits.

 

Darrell

thanks dudes!

 

panic over hopefully, hope its sumin stupid/easy to sort

 

(know nuthin is easy on a Z tho!!!)

 

dun mind the odd maintanence bill, its the big buggers that put me off!

 

so the cold heaters, big clue,

 

soon as i saw the steam and high temp, i put everyone on, to my horror was freezin! il do a search now.

 

anyone else feel free to post. dont think spotted water in the footwell tho? il have a check now tho

I dunno, I'd say a heater matrix, if it is that, isn't the easiest job in the world. Dashboard out. I believe that a few people have managed to do it without removing it.

 

Hope you haven't warped your heads with the overheating.

Small water pipe round the back of the head is common and a pig to get to mine had a pin hole in and chucked loads of steam out .Had to get it pressure tested to find the problem.

drove very slow, and stopped 3 times, being carefull.

 

dont think would have done any damage.

 

ive checked the passanger floor, and its bone dry.

 

fingers crosst its a pipe or something? or just an air lock?

 

or even thermostat issue or something, (im not very good lol)

air lock wouldn't cause the steam though would it? it'd cause it to run warmer than normal but there wouldn't be any escape. maybe a split pipe somewhere. shame you couldnt pinpoint it from the steam while the engine was hot. good luck, as I am the lord and master of all hot Zs (at least I was, touch wood)

seemed to be coming from the drivers side more than the passenger side.

 

released the radiater cap, expecting loads of water to shoot everywhere but no, little steam and splash.

 

thanks for the replies, some advice to give the guy tomo.

mechaninc been on the scene..

 

Water Pump.

 

How much for new one?

 

will a UK 300zx one fit on my JDM Fairlady ?

I believe the water pump is the same on all models, according to this it is anyway

 

http://www.zcentre.co.uk/shop/product_info.php?cPath=21_52_46&products_id=129

 

I think its a fairly big job on one of these though although im not entirly sure. Might be cambelt off? Or worth doing the cambelt while all the kit around the water pump is off anyway!

Yup well worth changing the cambelt if you need to do the water pump.

 

People usually do it the other way around i.e. change water pumnp when they do the cambelt, but it makes no odds :).

I would also make sure your electric fan is working. Start the car up and pull the connector off the fan switch, the fan should cut in immediately. The fan switch is adjacent the temperature sender right in the front of the engine.

rad cap...change it only cost @ £6 eliminates one likely cause

if i was you i would check the viscous coupling on the fan because it could of just got hot in traffic because the fan wasnt working therefore got hot and boiled over into the expansion tank o/s

 

water pumps are the same but the pulley wheels are different !

thanks il check the electric fan after.

 

dont think its too bigger job.

 

priced a pump, £40 local motor factors.

thanks il check the electric fan after.

 

dont think its too bigger job.

 

priced a pump, £40 local motor factors.

 

 

You need to be careful with pattern parts in respect of water pumps. Some have a lower number of vanes on and thus circulate the water less which also leads to overheating.

Sorted!

 

some monkey had changed the water pump when did the cambelt,

 

but forgot to put a gasket on the water pump!!!

 

sorted now.

 

cost 35 quid for new pump

(with gasket)

 

and 70 quid for labour

 

:cool:

thats not bad at all!