Heater only blows out cold air.

[D1andonlyantman]

Well I just had a quick google of how to replace the matrix and am massively disheartened..... "Not a big job, I had it done in 6 hours" is not what I wanted to hear. Judging on today's performance I'd have it done in a week

[barrym381]

Well I just had a quick google of how to replace the matrix and am massively disheartened..... "Not a big job, I had it done in 6 hours" is not what I wanted to hear. Judging on today's performance I'd have it done in a week

sell it 

[D1andonlyantman]

Haha I'd rather freeze  but it is a bit annoying... I've got a couple of mechanic friends so I'll see how much they want to replace it I guess. It's a bit out of my league I think.....

[WadGTI]

Haha I'd rather freeze  but it is a bit annoying... I've got a couple of mechanic friends so I'll see how much they want to replace it I guess. It's a bit out of my league I think.....

How much coolant have you put in the car since draining it?

When the car is a 90 degrees, have a feel of the pipes going into the firewall and see how warm/hot there are.

[D1andonlyantman]

I was actually surprised how little coolant I lost when I took off the housing. It's probably taken about 2L. I thought about it and the chances of the thermostat AND matrix being broken are surely pretty slim and seeing as the thermostat was definitely nackered so I'll try and bleed it again later on today. I'll take the cap off and just leave it until it's really cooking and with any luck a sh!teload of air will come out

[dom]

I was actually surprised how little coolant I lost when I took off the housing. It's probably taken about 2L. I thought about it and the chances of the thermostat AND matrix being broken are surely pretty slim and seeing as the thermostat was definitely nackered so I'll try and bleed it again later on today. I'll take the cap off and just leave it until it's really cooking and with any luck a sh!teload of air will come out

Did you not drain the coolant before starting the job?

When you topped it back up did you dilute the coolant?

[WadGTI]

I was actually surprised how little coolant I lost when I took off the housing. It's probably taken about 2L. I thought about it and the chances of the thermostat AND matrix being broken are surely pretty slim and seeing as the thermostat was definitely nackered so I'll try and bleed it again later on today. I'll take the cap off and just leave it until it's really cooking and with any luck a sh!teload of air will come out

If you only put 2L back in/out, doesn't sound all off it came out and possibly a nasty airlock somewhere in the system.

As you have fitted your new theromstat, I would do a hardcore coolant change . What I mean by that is, run the car to 90c, switch off and drain whilst the thermo is open. Let the car cool for a good few hours and then fill back up.

Obiously at 90c it will burn your hands off, so use thick gloves and be very carefull. I would expect alot of folks are against what i have stated, but in past expierence, I usually get most of the coolant out of system this way.

[D1andonlyantman]

No I didn't drain all the coolant before hand. I thought it would work just as well to just take off the housing tbh. I threw In 1.5L of straight g13, that got sucked up after a while, and then I stuck in some distilled water. What I put in was probably 3 parts coolant, 1 part water.

I'll need to get more coolant because I've only got 1 bottle left but I will do a complete flush soon if it's a good idea

[D1andonlyantman]

Ok. Before I left work just now I started her up with the cap off. Sat inside revving making sure the cooling system was working hard. When I saw a bit of steam I got out and had a look and the coolant was near the neck of the expansion with bubbles in it with new ones occasionally popping up. When I got near to the top I turned it off and put on the lid before I lost too much coolant... Then as I was writing this the hose in the pic connected to the bottom of the expansion tank started really chugging and slurping and now the expansion is low on water. In guessing that's because the radiator has filled up now it's cooled down a bit and because I got some air out there's a bit more space?? Fill up again and repeat?

Thanks

[WadGTI]

yep thats the air coming out. Personally I would still drain out everything as it sounds like there is old and new coolant and possibly not mixed correctly.

Get the expansion bottle cleaned up and put some fresh new coolant in it. The golf will like it