General: 850: - Help. How pressuried should the cooling system get??

andy m · Jan 23rd, 2007, 19:02

Hello,

Obviously the cooling system on an 850 is a pressuried system, but how much pressure is normal. The reason I ask is that I have just changed the stat and therefore replaced the coolant, as well as the expansion cap (with a green one). The system seems to be running under a lot of pressure. The top hose from radiator to stat housing is difficult to squeese when the system is hot.

Is this normal???

i am scared that it is under too much pressure and may cause a leak at one of the joints. Temerature level is fine, not overheating.

Do the new green caps have pressure release incase the pressure gets too high??

Any help or advice would be greatly appreciated.

Thanks.

PNuT · Jan 23rd, 2007, 19:27

i believe the caps are rated about 1 bar..... they are designed to release excess coolant/pressure ect

when everything settles it should be fine

John_C · Jan 23rd, 2007, 21:55

AFAIK the top hose being hard to compress when the system is hot is perfectly normal.

Cheers,
J

andy m · Jan 25th, 2007, 12:14

Thanks for the responses so far.

Anyone else have any ideas?

Could it be that my old cap was not holding the pressure and that now I have a new one it is keeping the system under pressure, hence the top hose that is hard to squeese?? And that this is perfectally normal.

Regards.

ShadeTek · Jan 25th, 2007, 12:23

The old grey caps were prone to cracking and leaking. The new green cap will be working just fine. I think your panicking over nothing.

PNuT · Jan 25th, 2007, 13:36

andy the top hose is supposed to be hard, they run at nearly 15psi above atmospheric pressure & are full of water

300+_T5R_855 · Jan 25th, 2007, 16:15

You can try Evans cool and run a 0 pressure system. Evans cool is a synthetic coolant that doesn't boil until 360 F, hence no need for a pressurized system. I have been running it for over a year now without issue. It's easier on the coolant hoses, and seems to work well. The only downside is if you get a leak you cannot just add water.

PNuT · Jan 25th, 2007, 16:21

do you have anymore info on that stuff? i assume it doesnt freeze untill well below freezing etc?

andy m · Jan 27th, 2007, 19:35

Thanks for the replys. I feel a lot more reasured that my cooling system is not about to pop, so I can stop worrying.

Regards,

Andy

Jan 23rd, 2007, 19:02	#1
andy m Member Last Online: Sep 25th, 2023 07:44 Join Date: Oct 2003 Location: Swindon	Help. How pressuried should the cooling system get?? Hello, Obviously the cooling system on an 850 is a pressuried system, but how much pressure is normal. The reason I ask is that I have just changed the stat and therefore replaced the coolant, as well as the expansion cap (with a green one). The system seems to be running under a lot of pressure. The top hose from radiator to stat housing is difficult to squeese when the system is hot. Is this normal??? i am scared that it is under too much pressure and may cause a leak at one of the joints. Temerature level is fine, not overheating. Do the new green caps have pressure release incase the pressure gets too high?? Any help or advice would be greatly appreciated. Thanks.

Jan 25th, 2007, 12:23	#5
ShadeTek Premier Member Last Online: Yesterday 17:42 Join Date: Dec 2002 Location: Renfrewshire View Photos By: ShadeTek	The old grey caps were prone to cracking and leaking. The new green cap will be working just fine. I think your panicking over nothing. __________________ Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 93000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301/Topdon Top Scan

Jan 25th, 2007, 16:15	#7
300+_T5R_855 Trader Last Online: Nov 6th, 2009 16:13 Join Date: Jan 2007 Location: SF	You can try Evans cool and run a 0 pressure system. Evans cool is a synthetic coolant that doesn't boil until 360 F, hence no need for a pressurized system. I have been running it for over a year now without issue. It's easier on the coolant hoses, and seems to work well. The only downside is if you get a leak you cannot just add water. __________________

Jan 23rd, 2007, 19:27	#2
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	i believe the caps are rated about 1 bar..... they are designed to release excess coolant/pressure ect when everything settles it should be fine

Jan 23rd, 2007, 21:55	#3
John_C Allons-y! Last Online: Jun 8th, 2020 15:32 Join Date: Dec 2004 Location: Winchester	AFAIK the top hose being hard to compress when the system is hot is perfectly normal. Cheers, J

Jan 25th, 2007, 12:14	#4
andy m Member Last Online: Sep 25th, 2023 07:44 Join Date: Oct 2003 Location: Swindon	Thanks for the responses so far. Anyone else have any ideas? Could it be that my old cap was not holding the pressure and that now I have a new one it is keeping the system under pressure, hence the top hose that is hard to squeese?? And that this is perfectally normal. Regards.

Jan 25th, 2007, 13:36	#6
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	andy the top hose is supposed to be hard, they run at nearly 15psi above atmospheric pressure & are full of water

Jan 25th, 2007, 16:21	#8
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	do you have anymore info on that stuff? i assume it doesnt freeze untill well below freezing etc?

Jan 27th, 2007, 19:35	#9
andy m Member Last Online: Sep 25th, 2023 07:44 Join Date: Oct 2003 Location: Swindon	Thanks for the replys. I feel a lot more reasured that my cooling system is not about to pop, so I can stop worrying. Regards, Andy

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)