Author Topic: C4 87 Heater Matrix  (Read 2269 times)

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Offline MY081

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Re: C4 87 Heater Matrix
« Reply #24 on: June 16, 2020, 10:34:16 AM »
Mmmmmm I meant every 4 courses high witch  can create a problem from time to time. Uncle Doug is doing a great job of entertaining us ( especially since he explained what a Bloody Matrix is ) he always makes things more technical than they need to be.Why not say something that has rows and columns etc . Ray

Offline Vettech

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Re: C4 87 Heater Matrix
« Reply #25 on: October 05, 2020, 12:00:35 PM »
Well back again.
After much ado, and a lot of help (tks Bfit & Sirfixalot) we are at the stage of getting the hoses for hot water, steam/bleed and KC4 oil cooler sorted. I've installed the KC4 return metal pipe, getting into position just missing the steering column. We have deleted the Throttle Body heater and changed that fitting for a  90 unit with a ~8mm tail swetted into it, this will allow manifold water to exit via hose under the "AIR" pump/bracket, under the Alternator, do a left turn back to the Heater Matrix in the fire wall, whilst a new hose will allow the steam/bleed to be drawn into this water flow. 

A new hose from the Heater Matrix will return heater water around the radiator, under the A/C and into the Water Pumps small side inlet, but I need to dream up a fitting that is like a "Y" or "T" junction set in this hose right before the water pump and will allow the suction of water from the metal pipe (KC4).

My 87 or 90 dont have water taps either manual or vacuum in the cars heater cct, and I cant see any reference to taps in any FSM's or Youtubes , I'm assuming that the HVAC (Heat Vent Air Conditioning) uses a combination of hot matrix mixed with a cold evaporator to obtain passenger set air temps.


Online sirfixalot

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Re: C4 87 Heater Matrix
« Reply #26 on: October 05, 2020, 09:17:29 PM »
The water tap vacuum line is the grey tube out of  the Heater & Ac Programmer when looking at the vacuum plug the port is at 3 o clock. The solenoid inside programmer is 3rd from the left 86-87 has the solenoid 88-89 it appears to be deleted from factory.