Hey everyone...ive just come home from 5 years abroad and prepping my series 1 for an mot. So far so good however the heatings no longer working...looks like no vacumn. What should i do? I know my way round the system but its been a while.

regards
Gareth

 

Check your heater valve on the firewall
Walter

 

Yeah i checked this....should it operate if i sucked on the top vacumn pipe? Its currently shut and was a bit gunky but i only bought the valve a few years ago and it operates ok when i insert a screwdriver

 

I have attached the Service .pdf file that explains the heater operation and has pictures of the vacuum lines behind the radio. They are the probable source of your problems.. hose cracked/broken or one or more of the plastic nipples broken that the hoses attach(most of these parts are NLA new). You can fix the broken nipples by inserting small brass tubing from a toy model shop into the holes and using Epoxy to seal the gaps. Then you will have to adapt the hoses to the smaller OD of the brass lines.

You are lucky to have a S1 as they as much simpler than the later models.

 

Some from distant memory an d some from more current memory:


1. the vacuum source is a spigot under the intake manifold. Check to see if that hose is "good' and securely attached.


2. There is a vacuum reservoir in the left rear corner of the engine bay, Check hoses and attachments there.


3. The original water valve is metallic and as such subject to corrosion. A Mitty Vac is better than the most of us in creating vacumn. Use one to test open/close function.


4. In the left rear corer of the engine by, deep down, are two spigots for vacuum hoses. Can't see them in my LHD car, Only feel them.
Essential that each hose is good, secure and on the correct spigot.
Fortunately, the size is minutely different so as to allow the "right way" only connection.


Short version: Good hoses on the right spigots !


Early on in my ownership, I found my hoses spliced and poor condition. Replacement was educational and fixed a lot !


Carl

 

But when the engine is running shouldnt there be suction on the hoses? Im getting no suction..all my pipes seem to be in order with no broken nipples 🤔

 

Problem solved....cracked pipe in bulkhead that i just happened to run my hand along just as i was giving up! 😂😂😂😂
thanks guys

 

Read pages 4-6...follow engine vacuum from source. You can always introduce smoke into the pipes to easily find the leak. Look at You Tube to make cheap smoke.machine.

 

On my S2 yes I can suck on a tube and get the heater valve to actuate.