Range Rover heater??
Discussion
OK the weather is starting to get cold again, so cue non-functioning heater on my ’91 Range Rover! It’s been working intermittently for awhile now but I’ve always managed to fix it by giving the cooling system a good burping, it then works normally for a while and them packs in again. This time I cannot get it to work; anybody got any ideas?? 
When it works it works well giving plenty of hot air so the matrix isn’t blocked, the coolant pipe going into and out of the dash are hot so there is coolant flowing into the heater. I’ve checked the hot/cold flap linkage as far as I can into the heater and it appears to be working, I can also hear the flap opening and shutting. The thermostat is OK, tried a couple of new ones but the engine gets up to a steady 88degrees and sits there all day. I thought with it getting air locked all the time I might have the dreaded cracked liner or blown head gasket, but it uses very little coolant and there’s no oil in water or water in oil.
Help me I’m at a loss, and I’m bloody cold!!
Andy
When it works it works well giving plenty of hot air so the matrix isn’t blocked, the coolant pipe going into and out of the dash are hot so there is coolant flowing into the heater. I’ve checked the hot/cold flap linkage as far as I can into the heater and it appears to be working, I can also hear the flap opening and shutting. The thermostat is OK, tried a couple of new ones but the engine gets up to a steady 88degrees and sits there all day. I thought with it getting air locked all the time I might have the dreaded cracked liner or blown head gasket, but it uses very little coolant and there’s no oil in water or water in oil.
Help me I’m at a loss, and I’m bloody cold!!
Andy
Hi Andy,
I had a similar problem on my old RR 3.5 1988my
sometimes the air would blow cool (not cold) then would change to hot with no adjustment to the heater controls
then blow cool again, this went on for about 3 months maybe longer, after consistently checking for oil/water contamination and finding it clean with only a small loss of water each time it baffled me.
then one week the engine was down on power had a look at the oil and there was a load of white sludge inside the rocker and on dip stick the head gasket had gone.
it had done nearly 167k and used to knock a bit on start up.
I had a similar problem on my old RR 3.5 1988my
sometimes the air would blow cool (not cold) then would change to hot with no adjustment to the heater controls
then blow cool again, this went on for about 3 months maybe longer, after consistently checking for oil/water contamination and finding it clean with only a small loss of water each time it baffled me.
then one week the engine was down on power had a look at the oil and there was a load of white sludge inside the rocker and on dip stick the head gasket had gone.
it had done nearly 167k and used to knock a bit on start up.
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