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    Heater does not getr hot

    I have just bought a 1977 stag "my first one" and though it does not overheat and there are no signs of any leaks the heater does not get hot, any recommendations please?

    #2
    Welcome to the forum Terry. The control valve at the bottom of the heater often seizes if not used, or if the cable has come adrift. You'll find it in the drivers side (RHD) footwell area, but it helps if you are a contortionist. This is normally fairly easy to sort, but make sure that you have new 'O' seals before you start, and generally the valve cleans up with Scotchbrite. People have developed various pullers to withdraw the valve, which you can search on here to find (my totally over-engineered version is in the photos). Essentially, the fine screw thread in the end of the valve is the same as the front indicator cover screw. Be also prepared to catch the smallish amount of coolant that will come out.

    Dave

    IMG_1665.HEIC IMG_1666.HEIC

    Comment


      #3
      You also might want to try a flush with a hose pipe before taking apart if the valve is moving ok.
      Years ago has a Cortina that never blew out hot air, coolant was changed and flushed but was pretty clear. The heater matrix on the Cortina was easy to remove and so I took it out, you couldn't blow through it. Connected to the garden hose and the other side was a fountain of rust coloured water and gunge, ran clear, connected the other way round and more gunge blown out.
      Fitted and worked perfect.
      I think part of the problem as well is that the heater water is slower moving so a trap for anything in the cooling system to get caught.

      Comment


        #4
        My Stag specialist advised me to ensure when refilling the coolant to have the front of the car up on ramps. Then make sure that the heater control is on hot when filling up with fresh coolant. Then run the engine so as any air that my be in the system goes to the highest point. That is the radiator top nut. I am also advised to make sure I run the heater "on" on a regular basis.

        But if your system is gunged up, then Roy's advice holds good.

        Comment


          #5
          Terence.
          It is also worth checking that the hoses to the heater are correctly fitted. The one from the l/h cylinder head should go to the lower (inlet) pipe and the upper one back to the water pump. This ensures that any air entering the heater matrix will immediately be removed.
          Mike.

          Comment


            #6
            Thank you all gentlemen, Are the O rings readily available do you know Dave & are you suggesting that if the valve is not too stuck it may pull out using an indicator lens screw pulled with mole grips?
            I must admit that my first thought was to remove the thermostat housing to check if it has one having purchased a new one just in case, and following on from this to disconnect the hoses from the matrix and try a flush through Roy, I will check that the hoses are on in the correct order too Lingen.
            Not sure about the ramp idea I thought if you topped up at the large blade bolt at the highest coolant point with the correct level in the bottle it should self bleed? but as I stated I am new to Stag ownership so any advice is worth a go.
            I have managed to find contact details of the owner who had the car for 37 years up to December 2020 when He sold the car through classic car auctions,(from what I can gather it has been through 2 traders before passing to me mid April 2021), and He has offered me the hard top a pair of carbs, 4 spare wheel rims and a full set of workshop manuals, so if I can arrange to collect these next week it may make sense to leave well alone until then.

            Comment


              #7
              Terence. The temperature gauge should tell you if a thermostat is fitted or not. Or you could start the engine and see if the top hose and the radiator start to warm slowly. If they do then either there is no thermostat or it has failed "Open". Both would normally remain almost cold till the temperature gauge is on the move, and then suddenly get hot when the thermostat opens. Heater valve O rings are readily available.
              If all the waterways in your inlet manifold are unblocked, and a thermostat with a "Jiggle" pin is fitted, then the cooling system should rapidly self-bleed without tipping the car about. Only the heater will need bleeding by running the engine for a minute with the heater valve open. Which brings you back to square one!
              Mike.

              Comment


                #8
                If the valve is stuck to turn, it's probably not going to come out easily by just pulling a screw with mole grips. Mine was firmly stuck due to the car being driven by my father only during good weather and thus heater on cold.
                Each time I drive it now, I try to remember to cycle the valve.

                Comment


                  #9
                  Check the heater valve outer cable ends are still securely clamped by the green clips.
                  If the valve lever doesn’t turn but the control lever moves, the clip has usually given up / come off, as the heater valve has become seized.
                  Flushing the matrix might improve things, but it won’t if the valve is stuck shut.
                  There are 2 secrets to staying on top :- 1. Don't give everything away.
                  2.

                  Comment


                    #10
                    Thanks again all, Mike, the temp gauge rises steadily from cold start to just below centre and stays there "as I would expect" So I will start the car and monitor the top hose as you suggest to see that result, do you know if the O rings are a listed item from say Rimmer Bros / James Paddock?
                    I take your point Mr Taylor.
                    I must check the heater cable clip for an easy fix first, Mr Buck. and I think Dave made mention of it also.
                    A good few suggestions for me to try if it ever stops raining again, we had the dry spell but too cold for working outside now the rain!!!!

                    Comment


                      #11
                      Just to add that mine heats up pretty fast, but the top hose is cold pretty much until the needle is at normal.

                      Comment


                        #12
                        Terry, I am just down the road from you in Melton Mowbray. I may not be great on the mechanics but if you want to take a trip down the vale I would be pleased to meet you and we can discuss all things Stag. PM me if you are interested.

                        Dave.
                        Dave.
                        Expert:- Ex is something that has been and spurt is a drip under pressure.

                        Comment


                          #13
                          Good evening all contributors great news, I “with your help” have found the problem. The bad news is I had to remove the centre console it was the clip but at the heater control lever end not the heater box end, so the controls lever bracket was released and the 2 outer cables were removed to invert the controls lever bracket so I could get at the centre heat control cable and replace the clip with a new one. I have got the control lever bracket back in place so just the rest of the console and switches to put back. Thank you all so much.
                          Dave from Melton not sure how to PM. A bit thick with technology better with my hands. If you are happy to email me it would be good to meet up I believe there is a regular classic car meet in Melton?
                          terence.carney7378@yahoo.com

                          Comment


                            #14
                            If there is a Melton meet I could get there too. PM me with details?
                            Header tanks - you can't beat a bit of bling.

                            Comment


                              #15
                              Wilf, Terry there is a meet in Melton market place early evening of the last Friday of each month April-September. Not sure if it has started again this year but will try and find out and let you both know.

                              Terry, also Grantham Classic Car Club meet at a sports field in Harlaxton village on a Wednesday evening. Perhaps Google their web site for advise on if and when they will be meeting again post covid.

                              Dave.
                              Dave.
                              Expert:- Ex is something that has been and spurt is a drip under pressure.

                              Comment

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