Fixed all but still runs warm/hot - Land Rover Forums : Land Rover and Range Rover Forum
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post #1 of 20 (permalink) Old 03-10-2019, 10:35 AM Thread Starter
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Fixed all but still runs warm/hot

Hey, I am at a loss here. I bought my dream truck an 89 RRC County last summer and knew it had quirks like constant battery light (I had the alternator rebuilt, and a new optima battery, cleaned off all grounds except possibly one I missed?), the washer fluid light (even though the res was full. Float switch probably corroded), The heater core diversion, some other odds and ends like leaks into the floor boards(probably sunroof drain) Oh yeah and rough idle (new idler thingy fixed that). But with all that, I drove it through a blisteringly hot summer, it still ran a little warm well it was id say 3/5 of a tank warm on the temp gauge, I'd kick on the a/c and let the aux fans kick on and we were fine.

Well, after all of that, I started noticing it would edge past the 3/5 line and work its way to the 4/5 line. The top line was tight so, I grabbed a new thermostat and installed it, thinking that would remedy the issue. It did... for a while.

Winter arrives and I start noticing it still ran 3/5 - 4/5 warm I checked all the fans, they all worked, the thermostat was trucking along. I thought maybe head gasket??? So I checked the oil. Clean as a whistle, did the exhaust gas test on the radiator, the color never changed. So I said, what the hell, I replaced the heater core, It still went to 4/5 hot, then installed a new water pump, and some new hoses. Still 4/5 hot. I made sure I topped off with rad fluid all over the place, still, 4/5 almost reaching into the red but never getting there. It's not leaking rad fluid, It's not blowing white smoke, the oil's not milky. The viscus fan feels viscus-y when I turn it when warm... When I take off the cap to the overflow tank and squeeze on the hoses there is movement. Is it the radiator? Is it the head gasket? Is it the temp sensor? The engine feels freaking hot (I don't have a thermometer) But is def baking.

My question to the great and wonderful forum... What the hell is going on with my truck?!?!? I yield the floor.
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post #2 of 20 (permalink) Old 03-10-2019, 11:44 AM
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The viscus fan feels viscus-y when I turn it when warm
To rule it out try to stop the viscous fan with a rolled up newspaper when the radiator is hot... if you can stop it that's the problem

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ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #3 of 20 (permalink) Old 03-10-2019, 12:40 PM Thread Starter
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I was able to slow the fan almost to a stop. Can this be repaired? Or do I need to get a new one?
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post #4 of 20 (permalink) Old 03-10-2019, 03:51 PM
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Do not know about the RR but on my Disco II the directions from the FSM are pretty simple:
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post #5 of 20 (permalink) Old 03-10-2019, 04:06 PM
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Are you sure it is actually running hot
I had changed my temp sensor with a new one
Nothing wrong with the old one
And the new
Showed I was running hot
Right below red line
Ok we this wasn’t right and reinstalled the old one
Been fine as before
I would check the coolant temperature
Just to rule it out

im an american i dont speak english
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now parts
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post #6 of 20 (permalink) Old 03-10-2019, 10:16 PM
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Originally Posted by mburnley01 View Post
I was able to slow the fan almost to a stop. Can this be repaired? Or do I need to get a new one?
A good one should be locked solid and rip the newspaper apart when the radiator is hot... IMO you need a new one

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if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #7 of 20 (permalink) Old 03-11-2019, 06:14 AM Thread Starter
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I ordered the clutch, going to install and tell you the findings

Thanks!
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post #8 of 20 (permalink) Old 03-12-2019, 12:19 PM Thread Starter
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Installed the clutch still running hot but not as hot. a little bit higher than 3/4 now but not 4/5. This is killing me. Should I check out temp sensors next?
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post #9 of 20 (permalink) Old 03-12-2019, 12:31 PM
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You should flush the radiator or better the whole cooling system with dedicated stuff, something like this https://www.amazon.com/d/Radiator-Fl...204/B00BJOT9A8 then fill it and bleed it by the book

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if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #10 of 20 (permalink) Old 03-12-2019, 02:57 PM
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I recently read that with the new radiators today a flush does not work. Says that the passages are too small and that they meander back and forth in the radiator instead of traveling in, around and straight out.

So does this radiator qualify for a flush?

Well, I just re-read that this is a 1989. So have no idea when the smaller passage radiators appeared.
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post #11 of 20 (permalink) Old 03-17-2019, 07:58 AM Thread Starter
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Flushed the radiator multiple day flush. The water came out clean. Still runs warm 3/4 4/5. Radiator change is next. I will also order temp sensor but I am sure that is not the issue. Any more ideas?
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post #12 of 20 (permalink) Old 03-18-2019, 06:43 AM
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Did you flush only the radiator or the whole cooling system? ..cos IMO just the radiator is not enough

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #13 of 20 (permalink) Old 03-18-2019, 09:08 AM Thread Starter
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Flush

I flushed the entire system. I then took temperatures at separate points on the engine while running at different time intervals for over an hour. The hottest point on the engine was 175 at a bolt on the head on the passenger side in between the two center spark plugs. The engine still read warm. See attached images.
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post #14 of 20 (permalink) Old 03-18-2019, 04:18 PM
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It’s good that you have a infrared gun.
Temps you show don’t indicate hot.
I would try upper hose surface temperature and rad surface or rad tank surface temperature.
If they are also su 190 then you can be very confident it is an inaccurate gauge.

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post #15 of 20 (permalink) Old 03-18-2019, 05:42 PM Thread Starter
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Rad temps

As a matter of fact I have those I also checked the radiator after I shut it down behind the fan, no pics 100 degrees

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