4th gen heater probs

Post by **indigolemon** » Mon Oct 14, 2013 9:39 pm

On the engine side of the bulkhead I believe. Little valve inline on the heater matrix feed.

Post by **paul72** » Mon Oct 14, 2013 9:43 pm

Ok ill have a look tommorr but if its where i think u mean the abs is in the way as i was looking today to remove air con pipes an cant see anything in that area due to abs in the way

Post by **paul72** » Tue Oct 15, 2013 8:21 am

Ok there is nothing but the two pipes coming out in the engine bay so i looked under passenger side footwell an found the mixer rod it does move wen changinging temperature but now its completly cold an no warm at all .
Help its freezing wat cud of done this now as there was some heat before

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Oct 15, 2013 9:04 am

Does the jdm system also mix air to get the right temp? If so, might be another valve/flap that should be operating too. Is it covered in the service manual?

Otherwise, try bleeding the cooling system (just in case there's an air lock) and if that's ok, try back-flushing the heater matrix to see if any crap comes out. If not, you could be looking at a scaled up matrix. Has the car been run with proper coolant rather than just water?

Post by **paul72** » Tue Oct 15, 2013 9:13 am

No its been run with just water but it was warm till i turned it down this morning to see if rod moved an now its just cold but rod is still moving

Post by **paul72** » Tue Oct 15, 2013 8:39 pm

I did a flush at dinner couple times then refilled with antifreeze an have now found wen revving car or driving the heater gets hot ish but as soon as on tick over its only luke warm , plus i found a valve on bulk head it moves but returns back as its quite stiff an has vacuum pipes to it , anyone know wat this does or wat to try next

YouTube · Post by **Sailor** » Tue Oct 15, 2013 11:20 pm

wurlycorner wrote:Not without looking it up myself, no.

Look it up yourself? Why, where did you stash it?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Oct 16, 2013 6:20 pm

Post by **Thebusofwoe** » Wed Oct 16, 2013 6:42 pm

Since you say it gets warm/hot,ish when you rev it then its either partly blocked or its got air in the system. The valve is on one of the pipes coming to/from the bulkhead behind the motor. Does the little arm move all way foward and back, what heat is in either of the two pipes?? Can you hear a gurgling sound inside when u rev it??

Post by **Thebusofwoe** » Wed Oct 16, 2013 6:48 pm

Its also bad to run just water as it will quickly corrode anything up it can. And will quickly block rads and heater matrix.