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Model specific boards => Golf mk2 => Topic started by: m4nesh on 21 November 2003, 15:10
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Ello Ello Ello ;D
Going to do a radiator flush and I dont think my coolant has been changed since it was new in 91. Do you think this is why the my heater blows warm....I have read other posts about the by-pass valve but if i can escape buying it all the better. ???
regards
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you shouln't have to buy the bypass valve if it hasn't been done already
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If you don't get hot then it could be a clogged matrix, or you might need a new by-pass valve.
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could a stuck open thermostat mean the engine doesnt get properly warm?
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thermostat is fine as engine heats up fine
gonna flush it today will let know what happens
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Thermostats rarely get stuck open and unless you have fitted a failsafe one will always fail closed and lead to overheating.
The by pass vavle should have been fitted as a recall and VW would have notified all the owners of the affected cars. Open the bonnet and look just infront of where the coolant hoses enter the car for the matrix, if you see a valve then you have it.
A best bet is to take the rad off the car and invert it, then reverse flush it as if you have a blockage you're gonna flush more crap into it leaving it on the car.
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Can you help? Here i
1. Can anyone tell me the capacity of the coolant system as the haynes says 6 litres and Ive only put in about 4 litres and its full?
2. Coz i thought the coolant system had a six litre capacity i put in 4 litres of coolant but then there was not enuf room for water. Do I have to drain some of the coolant out and put water in or will it be ok with just 4 litres of concentrated coolant?
3. Still only getting luke warm air after flushing the system? Any suggestions?
4. Is there a internal heater setting on the heater unit?
5. The by pass valve seems to be working cause the hoses are hot either side of the valve. Do you reackon i should change it?
6. Anybody wanna have a stab in the dark and guess?
Responses much appreciated
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When you filled it up with coolant did you squeeze the radiator pipes to pump the coolant around the system?
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When you filled it up with coolant did you squeeze the radiator pipes to pump the coolant around the system?
Yep I did that, what i did was release the bottom radiator pipe, then the top radiator pipe and flush it with a running hose pipe. Then I got the pipe connected to the cylinder head and by pass valve and drained that and flushed it with a hose up through the by pass valve. Squeezed the pipes and then hey presto 2 litres gone somewhere?
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oh yeah and ran the engine until with the lid off till fan kicked in
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That should be ok then Manesh. as long as the warning lights dont come on.
Not sure about your heater problem though mate
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Wheres the VW GTI Geeks!!!! :o
1. Richard Hazel
2. Moderator
3. Golfvr6
If you gotta problem, if you can find them, maybe you could hire......the VW GTI Geeks!!!!!! Guns Blazin(Sound Effect!)
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m4nesh. hello mate there are two bypass valves . one metal and one plastic . i was a bit sceptical about fitting new valves . would they work ? can i do it myself ? the ansewers are yes in both cases . its worth the ? 28.00 if not you could try a scrap yard and get second hand ones but thats a bit risky whos to say they arent knackerd! good luck mate.
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When you filled it up with coolant did you squeeze the radiator pipes to pump the coolant around the system?
Yep I did that, what i did was release the bottom radiator pipe, then the top radiator pipe and flush it with a running hose pipe. Then I got the pipe connected to the cylinder head and by pass valve and drained that and flushed it with a hose up through the by pass valve. Squeezed the pipes and then hey presto 2 litres gone somewhere?
You need to take off the bottom radiator hose, and the bypass hose on the thermostat housing.
Hope that helps,
golf geek :-* :-*
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Run the engine up to temperature and put the setting on the heater to hot. now carefully touch the heater matrix feed pipes that are passenger side bulkhead and you should have heat on both of them. If you dont and I am pretty sure by what your saying you wont then the heater matrix is blocked up and needs reverse flushing.
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Run the engine up to temperature and put the setting on the heater to hot. now carefully touch the heater matrix feed pipes that are passenger side bulkhead and you should have heat on both of them. If you dont and I am pretty sure by what your saying you wont then the heater matrix is blocked up and needs reverse flushing.
I have just done that and the hose going into the bulkhead from the bypass valve is hot and the other hose is cold(luke warm)...
So my question is how do you reverse flush the matrix? Do i pull cold pipe out and flush it with a running hose?
oh yeah and how much coolant mix? whats coolant systems capacity?
Cheers Mr Mod
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What you want to do is remember which one is cold as this is the feed out of the matrix as the hot is getting to it. remove both pipes and push the end of the hose pipe into the pipe which was cold. Turn the hose on and hopefully you should get a lot of rusty mess coming out. keep it going till you get clear water coming out.
My haynes says 6.3 litres capacity but I'll double check later with my bentley manual which is downstairs.
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Mr Modulator
I have just done what you have said, firstly, the bypass valve hose flushed that with hose then the other hose from the bulkhead got the hose and with a hose clip on flushed it the other way, used some real force to get water to come out the other way. However, did everything as normal run engine with water lid off till fan kicks in....but still no joy with heater.
One thing i did notice was that the hose going into the bypass pass was hot but the hose coming out of the bypass valve was cooler(Not same hotness)? Which only leaves me to conclude that i need a new bypass valve.....
I put in rougly 4.5 litres of juice....2 parts coolant 2.5 parts water is this ok?
Is there a heat control switch within the matrix or something?
Cheers
A Mr "Cold" Manesh :-[
p.s. much appreciated Mr Modulator ;)
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Sounds like your bypass valve.
The heater matrix is simply a heat exchanger and nothing else, no control's or switches associated with it.
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I have got the same problem as you m4nesh but I managed to get less coolant in than you did. The VW user manual also says we get about 6.3litres in.
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I have got the same problem as you m4nesh but I managed to get less coolant in than you did. The VW user manual also says we get about 6.3litres in.
I used a measuring jug just to be precise but i put in more coolant just to be sure! The other post about hose clips - i changed them all for jubilee clips?? Too late now after reading all the posts about them.
Im gonna get that by-pass valve, well let you know what happens!
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do you reackon eurocar parts sell by-pass valves??? Would be cheaper than VAG?
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With ref to not getting enough coolant in, are you sure you're draining all the coolant out? The obvious hose to undo is the lower radiator, but that won't drain the whole system.........the thermostat will still hold coolant in the engine, you need to undo the other relevant hoses too.
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Ideally take the thermostat out, but the by-pass hose on the thermostat housing will work as well. That and the bottom rad hose should drain all of the coolant.