Mo Reviews Posted November 4, 2019 Share Posted November 4, 2019 Hi guys, any usual suspects to look out for when trying to diagnose the reason(s) behind water in the passenger side footwell? Quote Link to comment Share on other sites More sharing options...
tayr Posted November 4, 2019 Share Posted November 4, 2019 have you spilt any drinks? Quote Link to comment Share on other sites More sharing options...
jim_supra Posted November 4, 2019 Share Posted November 4, 2019 Does it smell of coolant? It can be a sign of a leaking heater Matrix. Quote Link to comment Share on other sites More sharing options...
Scooter Posted November 4, 2019 Share Posted November 4, 2019 Yeah check the coolant levels, if they are down the heater matrix is a suspect. You can join the in/out matrix pipes (19mm - they are on the fire wall/bulkhead just right of the intake cam covers - one pipe comes from the rear of the cylinder head) temporarily. It's a massive labour job if it is the matrix though Quote Link to comment Share on other sites More sharing options...
rider Posted November 4, 2019 Share Posted November 4, 2019 Looks easy Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 have you spilt any drinks? Definitely not that... lol Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 Yeah check the coolant levels, if they are down the heater matrix is a suspect. You can join the in/out matrix pipes (19mm - they are on the fire wall/bulkhead just right of the intake cam covers - one pipe comes from the rear of the cylinder head) temporarily. It's a massive labour job if it is the matrix though Lovely prospect that... lol I'll have a look on Saturday but I'm REALLY hoping it's not this! - - - Updated - - - If I don't use the heater, would it still leak? Also, could it be the AC? Quote Link to comment Share on other sites More sharing options...
shaky Posted November 4, 2019 Share Posted November 4, 2019 It just bypasses the heater Matrix, so you will need no air con anyway , it's nice and cold Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 It just bypasses the heater Matrix, so you will need no air con anyway , it's nice and cold I've been using the aircon recently so was curious if that could also be a suspect? If, in the interim, I don't use the heater, will it still leak inside or would that not make any difference? Quote Link to comment Share on other sites More sharing options...
evinX Posted November 4, 2019 Share Posted November 4, 2019 Not sure what happens when the evaporator (behind the lower glovebox) gives out, but usually a well foot well is the heatercore, is it steaming? it will make the car loose all the coolant into the cabin if run long enough, check your rad and temp. or pull up the carpet and see what liquid it is Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 It is pretty steamy in the cabin, partly why I was using the AC to get rid of the condensation... I've pulled the carpet up and will check the coolant level over the weekend, though slightly easier said than done with an aftermarket rad and catch tank! Lol the joys of a modified car... Quote Link to comment Share on other sites More sharing options...
evinX Posted November 4, 2019 Share Posted November 4, 2019 Hot steam and a somewhat sweet ish smell would say the heatercore. Hes a quick test. Touch the carpet and see if your hands get stickyish...would be coolant. Quote Link to comment Share on other sites More sharing options...
Annabella Posted November 4, 2019 Share Posted November 4, 2019 Check if it's brown and runny. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 Check if it's brown and runny. Lol, I don't think its powerful enough to invoke that sort of reaction, yet... Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 Hot steam and a somewhat sweet ish smell would say the heatercore. Hes a quick test. Touch the carpet and see if your hands get stickyish...would be coolant. The carpet is propped up at the moment as I was getting worried about the ECU and loom getting wet... I'll put it down over the weekend and go for a short drive to see if it leaks again. If it does, I'll do as advised and report back with my findings. From memory though, I don't remember smelling anything sweet about the water/liquid... Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted November 4, 2019 Share Posted November 4, 2019 Check your AC drain pipe is not kinked. This can cause a backup of water which will eventually start seeping out over your interior. Can be found in passenger footwell above ECU, will be a small rubber hose that goes through firewall. Otherwise, start praying its not your heater matrix. Cause thats a fun job Quote Link to comment Share on other sites More sharing options...
shaky Posted November 4, 2019 Share Posted November 4, 2019 My money is on the heater Matrix, do what Scooter said , it's not your daily so you can fix it in the spring , it will still leak heater on or not . diy job or about 1k for someone else to do it. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 I'm praying already bud...lol Point to note though, I had the car up on the ramp over the weekend and I noticed an unusual amount of water dripping from the AC drain under the car. Didn't think much of it at the time but it's now got me thinking. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 Out of curiosity, if it is the heater matrix, god forbid, can those still be ordered from Toyota? Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted November 4, 2019 Share Posted November 4, 2019 Out of curiosity, if it is the heater matrix, god forbid, can those still be ordered from Toyota? Discontinued from Toyota last I checked. You can get aftermarket ones that fit but they never really perform as well as OEM (IE heater never really feels super warm). Chris Wilson may have been developing/producing a replacement heater matrix, but not sure what ever happened with that. Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 Are they common faults? This would be my first issue with a heater matrix... Quote Link to comment Share on other sites More sharing options...
shaky Posted November 4, 2019 Share Posted November 4, 2019 There was a link to some for sale on ebay , no idea how to find it though , yes it is a common fault on any old car , lots of posts about it over the years . Quote Link to comment Share on other sites More sharing options...
shaky Posted November 4, 2019 Share Posted November 4, 2019 https://www.ebay.co.uk/itm/Toyota-Supra-Mk4-heater-matrix-Made-in-the-UK-Brand-new-free-seals-and-clamps/202801086654?fits=Car+Make%3AToyota%7CModel%3ASupra&hash=item2f37e300be:g:04gAAOSwn4tdptj7 Last one ?? Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted November 4, 2019 Author Share Posted November 4, 2019 I've been quite fortunate then... It's not that dear to be honest, but I guess it's the labour I need to be concerned about! I'm keeping everything crossed for the weekend. Question is though, if it's not the matrix, what else could it be? Quote Link to comment Share on other sites More sharing options...
evinX Posted November 4, 2019 Share Posted November 4, 2019 I've been quite fortunate then... It's not that dear to be honest, but I guess it's the labour I need to be concerned about! I'm keeping everything crossed for the weekend. Question is though, if it's not the matrix, what else could it be? Nothing apart from the core or ac related...that drain pipe mike mentioned Quote Link to comment Share on other sites More sharing options...
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