slugger1 Posted November 5, 2012 Share Posted November 5, 2012 I've been having a few issues with the heater recently and thought I would try and solve it last week. A common problem appears to be an air lock in the system so I left the engine running with the rad cap off to see if I could remove the air lock that way. Whilst running the engine for a while (up to normal running temp) I felt the pipes either side of the matrix and both were cold! I was a little surprised at this because most air locks are located in the matrix itself (correct me if I am wrong). Could it be that maybe the thermostat is faulty or there is another problem elsewhere? I have searched the forums for answers but not come across one like this yet. Quote Link to comment Share on other sites More sharing options...
tkddav3 Posted November 5, 2012 Share Posted November 5, 2012 maybe its your heater matrix thats gone? checked the carpet to see if its wet? Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 5, 2012 Author Share Posted November 5, 2012 maybe its your heater matrix thats gone? checked the carpet to see if its wet? Carpet is dry. Wouldn't you expect the input pipe into the matrix to be hot or is it likely there is a blockage somewhere else? Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 5, 2012 Share Posted November 5, 2012 Is the whole of your radiator warm/hot ? You have an expansion tank i assume and its approx half full of coolant. You can try raising the rpm to around 2k with the rad cap off as this sometimes helps to get any air out the system. Do this with the heater on max hot Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted November 5, 2012 Share Posted November 5, 2012 As said make sure heater on max hot Quote Link to comment Share on other sites More sharing options...
straightsix Posted November 5, 2012 Share Posted November 5, 2012 When bleeding the air out of the cooling system, wait until the thermostat has opened and try giving all the hoses a good squeeze (including the heater pipes that go through the bulkhead). Sometimes air gets stuck in the system if the jiggle pin on the stat is in the wrong position (should be at the top) Quote Link to comment Share on other sites More sharing options...
Benjy Posted November 5, 2012 Share Posted November 5, 2012 Pop a matrix pipe off. Put a hose pipe up one end and see if water flows out of the other. If it doesn't, there's a blockage. If it does, refit the pipe, run it up with the cap off and see if it warms up inside. I had a Toyota Emina the other day that wouldn't bleed up despite trying pretty much everything including revving it whilst stationary to 3k. The only thing I could do was "Kamakaze" run it up the road and it pushed the air lock out. (Not recommended unless you're a professional, and about to hang yourself!) Quote Link to comment Share on other sites More sharing options...
Fizzy T Posted November 5, 2012 Share Posted November 5, 2012 Sounds to me like the thermostat isn't opening Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 Thanks for the replies. I have run the car and revved it to 2000rpm as suggested. I think I will give it a proper go at the weekend weather permitting! Just a question about the thermostat though, is it the small unit attached to a couple of metal pipes by the side of the radiator? Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 (edited) ........ Edited November 6, 2012 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 Follow the bottom rad hose to the engine, that is where the thermostat is located Look at the PDF on page CO-6CO.pdf Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 Follow the bottom rad hose to the engine, that is where the thermostat is located Look at the PDF on page CO-6 Cheers. What was it that I described earlier then? It has a small cap on it with a metal pin underneath. I think the cap has the letter 'H' on it iirc. Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 That's part of the air con pipe work Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 That's part of the air con pipe work Oh I see Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 There are 2 of the items you described and there used to fill and empty the air con systemAC.pdf Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 There are 2 of the items you described and there used to fill and empty the air con system Yes that's what I was referring to. I'll have to keep these PDF files for future reference. Very helpful! Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 There all available on the forum home page. Top left corner click on repair manuals and there's a dozen or so on just about everything to do with the mkiv gte & ge Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 Cheers. I'll let you know how I get on this weekend Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 6, 2012 Share Posted November 6, 2012 (edited) If you change the thermostat get a genuine one from Toyota with the correct opening temperature, i think its 82 degrees Edited November 6, 2012 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 6, 2012 Share Posted November 6, 2012 There is absolutely NO issue with either the N/A or the TT engines in the JZA80 suffering air locks in the heater or in the cooling system. In all the years i have worked on them not ONCE have I had ANY issue with bleeding air from the rad, the engine or the heater system. Now, the MKI and MKII MR2's are a different matter, and do require a specific routine. As Dnk says, fit a new genuine thermostat for a start. Pattern `stats (for any engine) tend to have more than their share of issues. Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 There is absolutely NO issue with either the N/A or the TT engines in the JZA80 suffering air locks in the heater or in the cooling system. In all the years i have worked on them not ONCE have I had ANY issue with bleeding air from the rad, the engine or the heater system. Now, the MKI and MKII MR2's are a different matter, and do require a specific routine. As Dnk says, fit a new genuine thermostat for a start. Pattern `stats (for any engine) tend to have more than their share of issues. Ok will try that first. Anyone got a spare knocking around? Quote Link to comment Share on other sites More sharing options...
Slicknick Posted November 6, 2012 Share Posted November 6, 2012 Give me a shout Stuart if you need a hand or want to cross check anything on my car Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 6, 2012 Author Share Posted November 6, 2012 Cheers Nick, I might take you up on that Quote Link to comment Share on other sites More sharing options...
slugger1 Posted November 7, 2012 Author Share Posted November 7, 2012 Had a conversation with a mate at work about this issue (he knows quite a lot about engines etc) and he said there is a possibility that the heater control valve might not be opening correctly which might explain why there is no heat either side of the matrix. Does this sound like a possibility? Quote Link to comment Share on other sites More sharing options...
Dnk Posted November 7, 2012 Share Posted November 7, 2012 When mine didn't work the matrix in and out pipes were still hot but its worth checking and think there is a thread on here so worth a search Quote Link to comment Share on other sites More sharing options...
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