S320 Climate settings and engine running temperature

PJayUK

Senior Member
Joined
Oct 7, 2008
Messages
281
Reaction score
0
At last we seem to be heading towards spring, what a lovely morning it was to drive into scenic Watford! :rolleyes::rolleyes:

Anyway this brings me to a question that it now seems the right time to ask, something that has not been an issue over winter.

My question relates to the operation of the climate control on my S320 (it’s a 2000 W220) and its interaction with the running temperature of the engine.

Basically this is what’s happening.

When the climate control is set around 25 – 30 as I have it when its cold the engine temp seems to stay bang on or around 80-90 degrees. There is some small variation for example if stuck in traffic etc but it rarely moves up above 90ish.

As the weather warms up and I set a lower temp on the climate control the engine temperature rises. When its on a cold setting in summer its not uncommon for my engine to run around the 110 mark.

If I select "economy" mode or turn the climate off all together the engine temp also climbs up towards the 110 degrees mark.

The coolant system was drained, flushed and refilled last year with proper spec MB coolant.the thermostat replaced and the system checked by my indi. The coolant level remains static there are no signs of leakage etc.

This confuses me as in previous cars I have owned the opposite happened. Running the AC seemed to increase the temp and turning it off generally caused the running temp to drop off.

This is going to be a source of great annoyance to me over the next few months so any advice, views or comments would be greatly appreciated!
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
The hotter the engine runs the more efficient it is, with the combination of fans that run you cannot and should not think about it, any fans that run because the air con is on are going to have an effect on the engine temp.
 
OP
PJayUK

PJayUK

Senior Member
Joined
Oct 7, 2008
Messages
281
Reaction score
0
  • Thread Starter
  • Thread starter
  • #3
So is this normal then Malcolm?
 

AIB understand your special Mercedes deserves a special insurance policy. We have a refreshing attitude to insuring high performance, modified, imported or classic and vintage cars and deal with the UK’s leading insurers. We offer discounts for length of ownership, where the vehicle is kept overnight and limiting the mileage and can also cater for those clients who need higher mileage and business use. To obtain a quotation please call the team on 02380 268351 or visit us atAIB Insurance
Top Bottom