Topic: Guide to Overheating (Read 3181 times)

V Mad · « **Reply #20 on:** June 21, 2007, 11:37:14 AM »

Quote from: Andrew on June 18, 2007, 21:30:45 PM

My 8v seems to run a little hotter than previous 8 valves ive owned, usually sitting between 95 - 98 degrees until the fan kicks in and (slowly) cools it down a little, ive flushed the system out (as the water was seriously rusty) and anti freezed it, I then checked the thermostat which was fine. however this hasint really resolved the situation, my previous callys the temp never really went above 90, any comments anyone? ps there is no head gasket issues.

The coolant sensors (especially cheap ones) are not always accurate. Try a genuine vaux part. Mine was reading much too high until I replaced it. Reads OK now.

Andrew · « **Reply #21 on:** August 16, 2007, 19:28:16 PM »

The rad has sprung several big leaks at the bottom due to this so ive got a new one on order to replace tomorrow, is it normal to hear the coolant boiling in the expansion tank?? could a shot radiator be causing this, and finally, where are the coolant sensors situated. cheers, Andrew

V Mad · « **Reply #22 on:** August 18, 2007, 12:07:47 PM »

Quote from: Andrew on August 16, 2007, 19:28:16 PM

The rad has sprung several big leaks at the bottom due to this so ive got a new one on order to replace tomorrow, is it normal to hear the coolant boiling in the expansion tank?? could a shot radiator be causing this, and finally, where are the coolant sensors situated. cheers, Andrew

No, it is not normal to hear coolant boiling in the expansion tank. Is it really boiling, or could it be pressure from the engine cylinders (head gasket or porous head)?

Have you let the engine run too low on coolant and seriously overheat?

Radiators should not leak from overheating. If it is an old one, they can fail due to plastic hardening/cracking.

Andrew · « **Reply #23 on:** August 25, 2007, 16:14:13 PM »

Ive had no success getting a new radiator so I stuck som radweld in and its worked a treat.

the car has never really overheated, just to the usual 98 degrees then the fan kicks in, it sometimes peaks at 100 degrees before cooling down to 95 and then when im out of traffic it fluctuates between 89 and 95 degrees. the boiling has stopped now ive sorted the radiator leaks out. currently trawling the scrap yards for a decent replacement as im not keen on radweld.

Ive had a few worries the head gasket had gone, however im informed this is fairly rare on 8 valves, the oil is clean as a whistle and its not using water now, there is a little water spitting out of the exhaust but I think this could just be condensation...i hope!

V Mad · « **Reply #24 on:** August 25, 2007, 19:32:12 PM »

I am still puzzled as to what was going on. Any boiling of the coolant is overheating, unless you depressurised the sytem ie what I mean is did you have the cap off of the expansion bottle at the time it was boiling? If so thats normal, otherwise I would be worried.

Andrew · « **Reply #25 on:** August 26, 2007, 09:17:37 AM »

Could that mean the system was depressurising because of the leaks in the radiator as I never released the cap of the expansion bottle?

fluffyman · « **Reply #26 on:** September 04, 2007, 15:00:27 PM »

trying to find out why a just fitted ecotec 16v engine fitted by garage would not give an acurate oil pressure gauge reading i.e needle off the scale but sometimes goes to half way point when not reving, also the temp gauge isnt budging past the first line on dial so no way of knowing whether overheating or if in fact running at right temp. i need as much info as possible as garage are trying to wash there hands of the problem and i need to sort it. fluffyman

Richie86 · « **Reply #27 on:** September 04, 2007, 15:06:16 PM »

was the original engine a 16v ecotec from the same year as the replacement?

rebel scum · « **Reply #28 on:** September 04, 2007, 15:32:38 PM »

Quote from: fluffyman on September 04, 2007, 15:00:27 PM

trying to find out why a just fitted ecotec 16v engine fitted by garage would not give an acurate oil pressure gauge reading i.e needle off the scale but sometimes goes to half way point when not reving, also the temp gauge isnt budging past the first line on dial so no way of knowing whether overheating or if in fact running at right temp. i need as much info as possible as garage are trying to wash there hands of the problem and i need to sort it. fluffyman

Oil pressure gauge should read 1.5 bar at idle with a warm engine,2.5-3 bar(approx.) when cruising and 4.5-5.5 bar when booting it.My 8v gives a high reading at start up when cold as cold oil is thicker and so pressure is higher but goes back to the pressures i stated once warm.Your temp gauge might not be going above the first mark on the gauge if its got a cool running thermostat in it.

schitzkin · « **Reply #29 on:** April 23, 2008, 17:47:57 PM »

can you get the same 92 fan switch for the 8v? My car has recently been getting far too hot and running poorly. The hose from the thermo to the radiator gets very swollen when hot and there is a lot of pressure from within. I have replaced the hose but am still having the same problem. there is no sign of any water in the engine or oil, I have flushed the engine and the radiator and there are no leaks either. My car has run so much smoother but is very rough lately, its really getting on my tits now. also there is a small oil leak beneath the outer dipstick casing. It looks like it could be spraying out from the dipstick-is this a common problem? any one else had similar issues with theirs?

V Mad · « **Reply #30 on:** April 24, 2008, 08:03:42 AM »

Quote from: likklejay on March 02, 2007, 20:03:27 PM

I have a 2l red top 16v. I was stuck in traffic in town and the temp went to 100c as i got out of town and moving the temp came right back down. On the motorway no problem normal running temp. Is this normal for the temp to go this far up. Any help appreciated.
Thanks

No its not normal. Assuming the fan was running, then either your fan switch or your gauge sender is Fxxxxd

Dutch Calibra · « **Reply #31 on:** April 24, 2008, 08:06:30 AM »

I don't want to start an argument, but AFAIK 100 is a normal running temp for Vaux engines, to quote RobbieV "They run better when hot"

gorytus · « **Reply #32 on:** April 24, 2008, 08:07:17 AM »

Quote from: V Mad on April 24, 2008, 08:03:42 AM

No its not normal. Assuming the fan was running, then either your fan switch or your gauge sender is Fxxxxd

It is normal. Fan doesn't come on until 102 in town.

V Mad · « **Reply #33 on:** April 24, 2008, 08:21:13 AM »

Lots of reaction to my posting there, but thats OK, I will explain.

When I first got my redtop car I spent weeks sorting out the cooling system (I wont bore you again with all the details, it is posted somewhere on this site if you suffer from insomnia lol).

Bottom line is that the redtop Calibras have two switches in one, the first cuts in at 95 deg and runs the fan at low power. The second cuts in at 100 deg and runs at full power.

Since I got it all running properly it has never gone over the 95 mark. I am not saying it never would but it would have to be under extremely hot conditions (will we ever get one of those summers again???).

So if your redtop regularly goes to 100, sorry to tell you but there really is something wrong, and I think you risk having head gasket/hose problems, but thats just my opinion FWIW.

If anyone want to know more about the 2 speed fan let me know, and I will go through it in detail.

Dutch Calibra · « **Reply #34 on:** April 24, 2008, 08:24:18 AM »

On the offchange that my Cally on sat is a redtop, PM me with the details please

Dec · « **Reply #35 on:** April 24, 2008, 08:43:44 AM »

95 is normal matey, most wont go to 100 unless very hot day and rarely, and this goes for most vauxhalls

andy_cally · « **Reply #36 on:** September 13, 2008, 08:53:11 AM »

i got air lock on my 16v i carnt get rid of too

sealeysonic · « **Reply #37 on:** September 13, 2008, 10:05:43 AM »

intresting post m8 8v loses water and i carnt see where the leak is <gg> im going to start replaceing the pipework 1st...then stat n a new rad....im also going to fit a Renult 19 bonnet vent to help...also a better cold ait fee to the ait filter.

andy_cally · « **Reply #38 on:** September 13, 2008, 10:11:02 AM »

i had a water leak on mine was a samll pipe down behind the inlet mainfold

sealeysonic · « **Reply #39 on:** September 13, 2008, 11:16:16 AM »

ahh yeh i had 1 on my mk2 cav...bugger to get to tho lol

Author Topic: Guide to Overheating (Read 3181 times)

V Mad

V Mad

V Mad

fluffyman

schitzkin

V Mad

Dutch Calibra

gorytus

V Mad

Dutch Calibra

andy_cally

andy_cally