Problem with coolant on LPG V8

smurphy · Oct 20, 2008

Hi I'm new to owning a land rover i brought it 2 weeks ago and the other day a coolant hose burst. Ive fixed tat problem but now when i rev the engine it makes a squelching noise behind the dash, now i think this is due to there being air in the system. But i don't know how to get it out i also think its down to the heater pipes being cut to tee in the LPG warmer. would it be better to get rid of the tee's connect it so its a complete system.

Thanks for any help or advise you may give regards Steve

rojbarker · Oct 21, 2008

Not sure if the engine you has has got specific bleeders for the coolant system - you can try running it from cold with the rad cap open until it warms - you should get some bubbles coming out the coolant. Then put the lids back on when the bubbles have stopped/slowed (or when the coolant looks close to overflowing the rad cap!). Depending on what engine, it may have copper bleed screws on the coolant pipes somewhere.

smurphy · Oct 21, 2008

Thanks i have tried leaving the cap off but no joy I'm lost really. I need to look at another LPG conversion to see if there setup is the same. Or if anyone knows if the way my system is setup is right or not. I really do think it is down to the way they have tee'd into the heater matrix pipes so the water is just going the easiest route and not pushing the air though.

smurphy · Oct 21, 2008

I've now got rid of the tee's and made it a circuit so to speak. Now I think I've got out all the air but now I can hear water rushing though the heater matrix when I rev the engine. I not heard of this before has anyone eles (someone please please help me.)

rojbarker · Oct 21, 2008

Check to see if they fitted a solenoid or valve somewhere that could be stuck open (or closed?) I'm not familiar with LPG setups so can't offer any helpful advice!

smurphy · Oct 21, 2008

Thanks for trying. I've spent the last hour going from forum to forum and it seem,'s that there is air in the system stuck in the heater matrix. Going to have another go in the morning when it's all settled (if it don't work ill bang my head against the dash till i go deaf then i wont notice).

Johnnydisco · Oct 21, 2008

maybe worth checking the rad to see if it has a bleed screw in the top of it ... undo it when its hot for best results .... cant u just releave the pipes when its running till all them are clear ??

meeme · Oct 22, 2008

I was about to post the same question as you. I also have the water "rushing" sound behind the dash. I am (mostly) certain that it is air trapped in the cooling system. I am going to try the following tomorrow:

1. Open the radiator cap, with engine running and heater on full blast and on recirculate.

2. Have someone squeeze the upper and lower radiator hoses.

3. Keep the engine revved to 1500 RPM's

4. Hope like hell that this fixes it, because I'm tired of the thing overheating and leaving me stranded!

I am not sure what the outcome will be, as I have not done this on a Land Rover before, but it worked for me when I tried it in my old VW Beetle and in a 1966 Plymouth Valiant Signet.

Also, I doubt the tee had anything to do with the overheating. Someone put that there so they could flush the cooling system. The air probably got stuck when you replaced the hose that had burst!

I will post the results as soon as I can. Cheers, and happy wrenching!

smurphy · Oct 22, 2008

Today was filling with gas and another landy was there got talking to the guy and he told me my problem was down to the head gasket.

He says that the air is being pushed in that way and that its a common problem with the V8. Well got me self a Haynes manual and all the tools so looks like I'm going to be forking busy

rojbarker · Oct 22, 2008

I'd verify that before you go taking the heads off. Get the cylinders compression tested. You can buy a tester for about £10-£15.
Is it overheating, loosing water, running badly or is there oil in the coolant or coolant in the oil? If it's not doing any of those things, it's probably not the head gasket.

smurphy · Oct 22, 2008

I went to see my local mechanic he did a sniff test and it showed up nothing, but he assured me that it probably got a pin hole in it. He had a range rover that was doing the same and the test was negative too

. So I'm looking for a really good gasket to fit anyone know where to get one from. It has been mentioned about getting a carbon one anyone any ideas.

smurphy · Oct 22, 2008

Am I wrong in thinking maybe the thermostat is staying closed or would then overheat? someone please help me I'm so lost in this car as i don't want to do the head gasket if poss

rojbarker · Oct 23, 2008

If the thermostat is failing closed then that will cause problems. Generally they are designed to fail open but that's not a rule.
The thermostat will take about 10 mins to take out completely if you want to rule it out of the equation. The car will run fine with it out - it'll just take ages to warm up.

Problem with coolant on LPG V8

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