Overheating disco 2 - Land Rover Forums : Land Rover and Range Rover Forum
 
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post #1 of 7 (permalink) Old 03-13-2017, 05:22 PM Thread Starter
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Overheating disco 2

Forgive me if there are 7.2 million overheating threads, but this is the first time posting, as well as asking for help after owning my discovery 2 for over a year. It's a 2004 SE with about 119k on the trans and body, and 150k on the 4.0 I popped in there after I dropped a sleeve at 99k. Went through the 4.0 with new gaskets, pumps, etc. did not change out the oil pump gear, but most everything else. It was snowing one day about a month ago,(I live in upstate South Carolina), and I drove the truck about 30 miles home, got in my driveway, temp shot up, and it blew off my expansion tank hose. (It's blown off before and cracked the plastic piece on the rad that it secures to). I've reclamped it since then. After that, it would idle for about 20 minutes, temps would begin to climb, but not reach the oh crap line. I usually cut the car off anyway out of fear when this happens. Thermostat seams to be opening. I purged the CRAP out of the cooling system, and heater core. I replaced fan clutch, and ordered a 180* warm climate t/stat from rovers north, and an oem rad. I flushed mine, it had great flow, with no hesitation..? But drivers side of the rad was way warmer than the opposing side, so I decided to order a new one. All my hoses are the same temp, and flowing correctly, I think... my next idea is a block test, but I had that gasket replaced 18 thousand miles ago. I never try to drive it hot, i always call a tow on the spot, and I'm oddly missing coolant constantly, (not in my oil, my heat works great, no white smoke on start). I know to check the top corner of the front cover, but I figure if it was leaking there I would see spots in my driveway, at least. Pulleys could use replaced, as some are getting tight on me...what am I missing here?
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post #2 of 7 (permalink) Old 03-13-2017, 05:53 PM
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Well, what stands out is that you did not mention having another way to monitor the water temp other than the stock gauge. That gauge does not click up or down in increments, it just magically goes to hot after you basically overheat. And usually it is too late then and you have blown a gasket.

So I would get something. I have a head up display which plugs into the OBDII socket and have been happy with it. But you need something.

Sounds like you need to check the compression to see if you have blown another head gasket. Maybe not; hope not.
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post #3 of 7 (permalink) Old 03-14-2017, 05:46 AM
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Have you replaced the radiator cap? You shouldn't be blowing off hoses.

If you've been reading about overheating, then you no doubt know that the temp gauge is a decoration. It moving past mid-point is usually the oh crap line.

If you're continually losing coolant, that's a bad sign. It's going somewhere. If it's not in the crankcase, it's either leaking into a combustion chamber or out of the engine. Your first check is to warm it up well and hook a pressure tester to it. If it won't hold pressure look for the external leak. If no leak, pull the plugs and see if you have leakage into the cylinder.

Have you checked the electric fan? Do you have the bleed screw tee on the top hose?

Some unclear points:

How often does it overheat, and is it low on coolant when it does?

Is the radiator new and if so, how recent?

Block test? gasket?
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post #4 of 7 (permalink) Old 03-14-2017, 07:34 AM
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Might I suggest that, while the radiator is out, that you replace the water pump as well? I'm going to replace my rad next month and will do the pump at the same time. Looks dead easy and I've heard of water pumps with plastic impellers wearing out; I'm taking no chances. They're cheap and easy, just like I like 'em.

2004 Disco II, bone stock, daily driver (gasp!)
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post #5 of 7 (permalink) Old 03-14-2017, 09:43 AM
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That's a good suggestion. Rockauto has a Delco- new, not reman. Metal impeller. $65.

Cavitation eats those plastic impellers up.
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post #6 of 7 (permalink) Old 03-16-2017, 11:52 PM
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i think you need to replace the radiator

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post #7 of 7 (permalink) Old 03-17-2017, 04:19 AM
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Originally Posted by sacer bonnie View Post
i think you need to replace the radiator
Based on what? He needs to go through some diagnostic steps before determining what's wrong. He could replace every piece of the cooling system and possibly find out he has a blown head gasket.

If money is no object, just take it to a shop- or buy a new car.
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