Engine Over Heating

[baker]

Hi Everyone

I

[bingo nightly]

Sounds like your losing water from the heater matrix behind the dash and its collecting in the drivers footwell.

[mikej]

As above, sounds very much like the heater matrix is shot, a simple way to prove it would be to join the two rubber pipes entering through the bulk head to the matrix (water in and water out)with a bit of old copper pipe etc this would then effectively bypass it although you would not have any heating and you may still have some water left in the matrix leaking on to your floor,i have found that old new papers are great at soaking this up,just lay them on the floor under the carpet and change them when then become soaked works great. at least you will know for sure if this is the issue before spending your hard earned :) Edited August 22, 2011 by mikej

[cyborg]

As Above , heater matrix & rads rarely fail on there own there's usually a problem causing the problem .so check

Fans ,Temp Sensors,Themostat & Waterpump

 

Fans

Switch on aircon do fans come on ? If they don't check 40 amp fuse engine bay nearside box beside shock piller

 

Then check resisters.

To make it easy I've added a picture below

On picture below theres red power lead disconnect undo that bolt then pull out the green resisters .The Green resisters can crack expose wires

which rust and disconnect over time.hence giving you no power to fans.To test connect up battery and measure both connections are giving 12v

its not uncommen green resister to fail.

Temp sensors

The main temp sensor is black,Its half way down radiator you can uplug and test by putting a paperclip across connections 1+2 and 2+3 fans should come

on on both phases its a bit tight to get to easly done by removing top rad hose.The fans should come on around 86 degrees.

 

The other three sensors are ;

yellow - additional water pump, run on pump

blue - sends temp to dash + ecu

brown - A/C fan

Themostat

 

Check the lower rad pipe is stone cold until the temp gauge reaches the half way point, if it gets lukewarm straight away then the thermostat

is stuck open or missing, if it stays cold then it is stuck shut.

 

Themostat housing complete breakdown by vanbusta on faq44 Vanbursta's Guide

 

 

Waterpump

Remove Coolent cap and check if you have a trickle of water with engine running at about 3000 rev's should spurt out of top pipe.To double check

Look for a trickle of coolent below the waterpump itself ,a sure sign its on way out .

 

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Incidently dash Heater matrix in and out is a 2 day Job 1 day if you've done one before...

[baker]

Thank you all for your replies your help is much appreciated. Talking with my mechanics they too have come to conclusion that it sounds like the heater matrix but will need to have a look first. They did say it could be an expensive repair. Can anyone tell me how much a new heater matrix would cost please?

Regards

Steve

[Mirez]

The matrix isn't the expensive bit, its the labour of stripping out the dash to get to the bugger.