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AuthorTopic: Vitara 8V nearly overheating  (Read 2279 times)

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Offline LP32

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Vitara 8V nearly overheating
« on: April 09, 2007, 20:50:52 »
Been upto the Lakes today to do a couple of lanes. When traveling on the Motorway I noticed the needle moving towards the red. After turing the heater on to Blow and hot the needle came back to normal. Later in the day during a stop I checked the water (expansion tank full) although a bubbling / boiling sound was coming from the radiator? On my return home I checked again the expansion tank was full and could still hear the boiling / bubbling also a Hiss from the radiator cap. After the engine had cooled I checked again - Expansion tank empty and needed about 1/2 litre of water. The temp has been fine all day providing the heater has been on hot. I am suspecting the radiator cap anyone any pointers. Thanks.
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Offline Evilgoat

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Vitara 8V nearly overheating
« Reply #1 on: April 09, 2007, 21:04:41 »
Filled the rad with crud? Blow it out with a jetwash or hose, take it easy though.

Done this a few times :)

Might also have a dodgey radiator cap or pressure leak. Bet if you look in front of the fan at the back of the rad that its caked.
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Offline LP32

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Vitara 8V nearly overheating
« Reply #2 on: April 09, 2007, 21:11:36 »
The back of the rad looks OK, not long had a new water pump fitted and the guy the did it had the rad off but don't think he checked it. its been running fine on round town runs for a month or two since the water pump.
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Offline Evilgoat

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Vitara 8V nearly overheating
« Reply #3 on: April 09, 2007, 21:50:28 »
Hmm bit sus. Is the rad actually getting warm?

Is there any pressure when you take the cap off? (use a rag to save your hand)
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I must confess the the activities of the UK governments for the past couple of years have been watched with frank admiration and amazement by Lord Vetinari. Outright theft as a policy had never occured to him.

-- (Terry Pratchett, alt.fan.pratchett)

EX HK Police Mitsubishi Pajero 2.8TD
Audi S2 Avant 360bhp
Transit LWB 2.5di (The Shed)

Offline LP32

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Vitara 8V nearly overheating
« Reply #4 on: April 09, 2007, 21:57:45 »
Rad is getting warm. Been OK local but the car never gets a real run until I use it, the other half commutes a mile round trip daily :roll:  Was guessing that it's when the engine is under load, Motorway and lanes etc?
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Offline Evilgoat

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Vitara 8V nearly overheating
« Reply #5 on: April 09, 2007, 21:59:20 »
See up. Sure someone else will come up with an idea.
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I must confess the the activities of the UK governments for the past couple of years have been watched with frank admiration and amazement by Lord Vetinari. Outright theft as a policy had never occured to him.

-- (Terry Pratchett, alt.fan.pratchett)

EX HK Police Mitsubishi Pajero 2.8TD
Audi S2 Avant 360bhp
Transit LWB 2.5di (The Shed)

Offline LP32

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Vitara 8V nearly overheating
« Reply #6 on: April 10, 2007, 20:13:36 »
Update: Did the water top up when I got back yesterday and have taken it for a run tonight, only 5-6 miles but gave it some pain and it was at temp, no heater on and no overheating and after turning off no bubbling sound? could it be a sticking stat? re the rad being hot yesterday it could just have just been warm? never realy took much notice I was just thinking how the RAC would get there to fix it
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Offline Evilgoat

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Vitara 8V nearly overheating
« Reply #7 on: April 10, 2007, 20:55:07 »
Quote from: "LP32"
Update: Did the water top up when I got back yesterday and have taken it for a run tonight, only 5-6 miles but gave it some pain and it was at temp, no heater on and no overheating and after turning off no bubbling sound? could it be a sticking stat? re the rad being hot yesterday it could just have just been warm? never realy took much notice I was just thinking how the RAC would get there to fix it


Might be. Off the top of my head I dont remeber where the stat is (must be old age as I was under the bonnet this afternoon). Might be worth taking it out and checking it, dropping a new one in if its not too many pennies. Problems with fuel and ignition can cause overheating too.
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I must confess the the activities of the UK governments for the past couple of years have been watched with frank admiration and amazement by Lord Vetinari. Outright theft as a policy had never occured to him.

-- (Terry Pratchett, alt.fan.pratchett)

EX HK Police Mitsubishi Pajero 2.8TD
Audi S2 Avant 360bhp
Transit LWB 2.5di (The Shed)

Offline StuartL

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Vitara 8V nearly overheating
« Reply #8 on: April 16, 2007, 19:43:09 »
Get the hose pipe on the radiator.  As I found out the radiator can conceal quite a lot of crud you can't see when it's on the Vit.

Get a low pressure hose, take the rad grille off, hold the hose close to the rad and slowly work your way across it.

If you feel confident (or have an infra-red thermometer) you can deduce where the cooling system is failing by following the water heat patterns around the radiator, water pump, manifolds etc.

I've just been through all of this, if you need a hand just let me know!
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Offline LP32

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Vitara 8V nearly overheating
« Reply #9 on: April 16, 2007, 20:54:32 »
Thanks for the response. after the initial problem I can't make it happen again so have changed the stat anyway. If I do get a repeat I guess the next step will be the rad. I can get hold of a IR thermometer so might just have a play anyway, when you did this how much variation did you get when it was running OK. Thanks
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Offline StuartL

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Vitara 8V nearly overheating
« Reply #10 on: April 16, 2007, 20:59:37 »
You should get a HUGE temperature drop across the radiator.  It should be hot on top at idle (when it's warmed up, of course) and cool at the bottom.  If it's not cool at the bottom poke around and see if has hot spots.

You can also check the temperature above and below the thermostat (the dome like thing at the other end of the water pipe feeding the top of the rad).  If there's a temperature difference the thermostat is closed.

For engine health (i.e. running temperature) check the temperature of the exhaust headers.  They should never get above 150 deg C and ideally should be less.

Stuart
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Offline LP32

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Vitara 8V nearly overheating
« Reply #11 on: April 18, 2007, 21:48:17 »
Problem solved "maybe" I tried all the sugested stuff and with no luck as it nearly overheated again. I have checked the viscous coupling on the fan and its not working :oops: Instead of replacing the unit I think I will go electric is there a Kit that is a direct replacement. Thanks for all your help.
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Offline Evilgoat

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Vitara 8V nearly overheating
« Reply #12 on: April 18, 2007, 21:59:36 »
I dont think there is.
You'll need a stat and fan, plus wiring. As its going in a Vit engine bay use good connectores such as the superseal ones simtek sell. It'll need to go on a new circuit as there isnt anything man enough on the loom as it stands.

Running it all the time will rob a fair few HP :(

Stat can be had from just about anywhere, I belive both paddocks and d4x4 carry them. Fan, you should be able to get from a scrappy, VAG aircon fans are small and damn powerful and a relay depending on the stat. Make sure the relay coil/stat is supplied from the ignition else you'll get the fan 'running on' after you turn it off. That said I know a fair few cars that do this. And remeber you only have a 40A alternator on an 8V carb as standard.

Or you could beg a viscous unit of someone for a few beer tokens :)

OR get a fron mounted fan and have both :)
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I must confess the the activities of the UK governments for the past couple of years have been watched with frank admiration and amazement by Lord Vetinari. Outright theft as a policy had never occured to him.

-- (Terry Pratchett, alt.fan.pratchett)

EX HK Police Mitsubishi Pajero 2.8TD
Audi S2 Avant 360bhp
Transit LWB 2.5di (The Shed)

Offline StuartL

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Vitara 8V nearly overheating
« Reply #13 on: April 18, 2007, 22:04:14 »
Quote from: "Evilgoat"
Or you could beg a viscous unit of someone for a few beer tokens :)


There's a possibility that I'll have a viscous coupling free in a few months.  Certainly not within a fortnight...
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Offline LP32

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Vitara 8V nearly overheating
« Reply #14 on: April 18, 2007, 22:34:54 »
Quote
There's a possibility that I'll have a viscous coupling free in a few months. Certainly not within a fortnight...

Thanks for the offer but need something sooner rather than later, let me know when available and if I am not sorted the tokens are yours :)
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Offline wheelspinner

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Vitara 8V nearly overheating
« Reply #15 on: April 18, 2007, 23:03:16 »
i have one in the garage if its any help.......

Steve
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Offline wheelspinner

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Vitara 8V nearly overheating
« Reply #16 on: April 18, 2007, 23:10:28 »
Kenlowe and Pacet both do generic fans in various sizes but they will be expensive........£100 ish

Id be off down the scrappy, i seem to remember a escort diesel fan is nice and thin also a chavalier gsi fan is a nice fit....
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Offline chris.hunt22

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Vitara 8V nearly overheating
« Reply #17 on: April 21, 2007, 18:57:50 »
How is it now Lee, with your 'ceased' viscous coupling??
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Offline LP32

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Vitara 8V nearly overheating
« Reply #18 on: April 23, 2007, 21:11:15 »
Chris

It seems fine now the fan is running full time.

Steve,

I have the mail thanks and will give you a call when I am next in the area

Thanks everyone for all your help

Lee
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