Hi all first post and sadly about the in-laws fabia.

 

Car is over heating as title says.

It's an 02 1.4 mpi

 

Changed water pump 3 days ago. Started making noise and a bit of water was missing on a weekly basis. Was original and needed doing.

Put this on and car over heated. A lot of pressure on the hosts at this point.

 

Save the messing around I done the head gasket as a simple job.  Stripping it all down I broke the thermostat housing so replaced this which cane with a new thermostat (was goibg to replace anyway) it also came with a new temp sensor. 

 

Job went well put all back together bled the system and the car over heated again.

 

Even though hot no fans kick on. Water cap off the coolant it blows straight out once past the half way mark temp wise.

 

No fans kicking on, but heat blowing in the cabin. But no heat on the hoses. 

 

Has anyone any ideas?

What am I missing?

Thanks in advance

Edited 7 December, 20178 yr by Aquaman

You've missed a cracked head or liner, if you have a lot of pressure in the system but you've done the head gasket then it has to be a crack, unless you disturbed the liners and one is proud or you didn't skim the head and it's warped.

If this is the case why did it not overheat before the water pump was done? Sorry if it's a daft question. Liners seemed all level. So only thing so far is head. This was apparently skimmed. And showed no signs of being warped. A bit was taken off only to clean it.

Thank you

12 minutes ago, Aquaman said:

If this is the case why did it not overheat before the water pump was done? Sorry if it's a daft question. Liners seemed all level. So only thing so far is head. This was apparently skimmed. And showed no signs of being warped. A bit was taken off only to clean it.

Thank you

 

No idea, if the car had no history of overheating why was the water pump changed? It doesn't make sense, you can't have high pressure and cold hoses, have you tried flushing it using a hosepipe?

The water pump was changed because it was then noisy and leaking. I'm assuming a bearing or something had gone in it. Looking at it I would say it was the original pump so changed it. 

 

Just confused as to why it's so hot why the hoses don't even appear warm. 

 

I didn't use a hose I filled it several times then removed the bottom rad hose to drain it.

Edited 7 December, 20178 yr by Aquaman

Have you still got the old thermostat? If so try swapping that back in, just in case the new one isn't opening, that might explain cold rad hoses, and overheating.

For the sake of 30 seconds may be also worth checking fuses associated with rad fan(s). Strip fuse #5 and blade fuse (under cover next to strip fuses) #8, in the battery-top fuseholder.

Edited 7 December, 20178 yr by Wino

Ive a spare t'stat here so will try it. But the over heating started originally after changing pump but before changing t'stat.

 

I've checked fuse 8 and it appeared ok.  Might change it just for piece of mind but the fuse 5 I don't understand how it comes out to look at it. I see 2 bolts but looks like s metal sheet of some sort covering?

Sheet metal is the fuse, unless I'm misunderstanding your description. If it looks intact (up close in good light) it probably is, but if you measure 12V at the wire end of it, that would confirm.

Seems far-fetched but is the new water pump actually pumping? If you rev the engine while looking into a capless expansion tank, do you see a nice squirt of coolant?

Edited 7 December, 20178 yr by Wino

I don't see any squirts of water in the expansion tank. But didn't with the old either. I originally thought pump faulty or impeller in correctly fitted? Is there a pipe I can remove? Guessing top thin pipe? That I can remove to confirm if pumping through or not?

The pump was slightly different original plastic and not looking like a standard impeller. New one looks like an impeller but a metal base.

Yeah, I think top thin pipe should squirt when engine revved. I'll just pop out to my Polo to check.

A little tricky to test without a helper and I didn't think the missus would jump at the opportunity, but a steady stream of drips at idle and more of a stream when revved. A video with a helper would've illustrated better, but if you've got nothing going on there, I'd say you have low or no coolant circulation.

 

Thank you for your help. Where I live is currently pitch black  ( no lights around) but will check this first thing in the morning. 

 

Your help is greatly appreciated. Sounds stupid but I really do hope just a faulty pump.