GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: HuwMk2 on 04 January 2010, 21:24
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Hi all. Fed up of icy interior glass and poor heater in this cold period. My golf is suffering from the following issues:
1. The temp gauge doesn't normally rise to even the first bar.
2. The heater blows luke warm on setting 1 but gets colder when turned up to 2 and stone cold on setting 3.
What do you reckon? Thermostat? Dodgy heater bypass valve? Matrix? Anything else?
Cheers.
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Same problems as you, people have suggested thermostat (official from VW) and copper pipe in place of the bypass valve for the heater (unless you can find a new one)
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Same problems as you, people have suggested thermostat (official from VW) and copper pipe in place of the bypass valve for the heater (unless you can find a new one)
Got the copper pipe ready to replace the bypass. I'll let you know how I get on! Will order a genuine VW thermostat.
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have a read of the cooling faq before you do anything else ;)
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Change the thermostat :smiley:
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Cant swap the heater bypass for copper pipe as intended - its never been fitted with a bypass! lol
Ordered a thermostat and housing from VW to collect on Sat. Fingers crossed this is the problem?!
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Ordered a thermostat and housing from VW to collect on Sat. Fingers crossed this is the problem?!
Probably is, but I wouldn't rule out a bust matrix. Check under the carpets and soundproofing in the passenger footwell - if the soundproofing is soggy and smelly, it's time for a new matrix. Ice on the interior glass in winter usually indicates some dampness in the cabin, but it could just be some snow that you dragged into the car with you or leaky doors.
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hi, similar problem with mine, heaters working fine untill full operating tempiture then start to blow cold, changed the thermostat recently, whats this about the heater bypass do you just repace it with a copper pipe? I havent got around to checking the matrix yet.
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Yes, two lengths of 22mm copper pipe, about 4" each.
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I have this problem... Matrix isn't blown..Thermostat replaced in summer.. Shut off valves done away with at the same time.. Reasonable heat in warmer weather but virtually non existent now.. Could the matrix block up? Limescale or general crap? Air block? Has anyone ever tried taking the pipes off and sticking a hose into it to flush it out? Another cold GTi driver... :sad:
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check rj s guide in mk2 maitenance.
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First part successfully done. I've replaced the expansion tank cap with the new blue version from VW.
The car is still extremely slow getting up to temp, so guaranteed thermostat issue. However, its a little warmer than its been!
Hopefully have my new thermostat and housing fitted on Saturday morning.
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stick a hose pipe down the pipes going in and out the matrix, will clear some crap out. probably a tempory fix though, will eventually need a new matrix i reckon.
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This is random but my heaters where suffering from very similar, bled the system out as you should (as said in the guide) ran through it all with no hope.
So thought maybe I had a small blockage in the matrix, waited for the car to reach tempature and then gave it a few blasts up to around 6k and somehow the heaters now work fine. Don't take that as advice.
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yeah if you bleed the system you do need to give it some revs now & again to get the air out, sometimes it takes a proper blast on t motorway to get heaters fully going
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It has jonnys stamp do take it as some advice :)
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I had exactly the same problem as described on my '91 8v, finally spent some time on it last week.
I'd replaced the bypass valves last year, just put a new expansion tank cap on from VW. New water pump and thermostat in September '09
Tried bleeding the system and no difference.
Then connected the matrix inlet pipe up to the outlet side to back flush it and ran the car while lots of very dirty water came out the open inlet side, when it ran clean coolant I connected it back up again, topped up the expansion tank and started to bleed it. Still no hot air.
Then I ran the engine up to 3500 rpm for about 5 mins, quick bleed and now it's spot on, it really needs to be under some pressure to push it all round. Having to run it with the slider more on the cold side otherwise it's too hot. Keep persevering, it's worth it. I know I may need a new matrix in time if the sludge has damaged it but for now it's water tight.
Good luck.
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An update:
As mentioned in a previous post, new blue genuine VW expansion cap fitted.
New thermostat and housing fitted and blasted a pressure washer through the heater matrix. Car is so much hotter!!! Success!!! However, I'm sure over the next few days it will get even hotter when some of the air is released. Roll on!