Climate Control and Vacuum
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 26
Likes: 2
From: Ohio
1998 SLK 230 Kompresor, 2013 C300 4matic Sport (W204)
Climate Control and Vacuum
I have a 1996 C220 which has the climate control system (not manual). I have no heat and poor cold air from the A/C. The only heat available is to the windshield via the defroster. Additionally, the vacuum pump continues to run after starting the car for about the first 5 minutes, then shuts off. No problems with the door locks as they work fine. I know there could be a vacuum issue, but would a vacuum pump replacement solve it? Or, would a used A/C control unit help? I will be looking under the hood as well, to see if any vacuum lines are cracked or pulled off.
Getting ready to sell it and don't want to sell it without the heater working.
Comments?
Thx!!
Nick
Getting ready to sell it and don't want to sell it without the heater working.
Comments?
Thx!!
Nick
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,456
Likes: 140
From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
I have a 1996 C220 which has the climate control system (not manual). I have no heat and poor cold air from the A/C. The only heat available is to the windshield via the defroster. Additionally, the vacuum pump continues to run after starting the car for about the first 5 minutes, then shuts off. No problems with the door locks as they work fine. I know there could be a vacuum issue, but would a vacuum pump replacement solve it? Or, would a used A/C control unit help? I will be looking under the hood as well, to see if any vacuum lines are cracked or pulled off.
Getting ready to sell it and don't want to sell it without the heater working.
Comments?
Thx!!
Nick
Getting ready to sell it and don't want to sell it without the heater working.
Comments?
Thx!!
Nick
Your asking members to guess what the issue is on a 23+ year old w202.
For the simple things, you make no no mention of checking your fuses and relays.
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 26
Likes: 2
From: Ohio
1998 SLK 230 Kompresor, 2013 C300 4matic Sport (W204)
I checked the fuses which are applicable to the CC and vacuum pump and fan. I sprayed with electrical contact cleaner and used emery cloth and reinserted all applicable fuses. Plus, I checked (again) all vacuum lines under the hood and none disconnected or have rubber connectors which are bad. I even pulled out the CC unit from the dash and checked for any frayed wires. All is okay. I tried the windshield defroster and it puts out heat. Then, I cranked up the temp to HI and the fan to max, which resulted in heat coming out the vents. When I lowered the temp to 72F, it was almost cold. And, it appears the engine coolant temp hovers just below 80C when idling. When driving it, it goes even lower, so I'm guessing that it could be a thermostat. Given that the coolant was flushed about 2 years ago, and it's not showing any discoloration, I don't believe anything is clogged (which could result in just the opposite issue), but the thermostat was not changed at that time, I will spend a few bucks and change out that puppy. If that still results in no improvement, I may look into swapping in a used CC unit, or just leave it alone and sell it "as is".
Thanks!
Nick
Thanks!
Nick
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,456
Likes: 140
From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
I checked the fuses which are applicable to the CC and vacuum pump and fan. I sprayed with electrical contact cleaner and used emery cloth and reinserted all applicable fuses. Plus, I checked (again) all vacuum lines under the hood and none disconnected or have rubber connectors which are bad. I even pulled out the CC unit from the dash and checked for any frayed wires. All is okay. I tried the windshield defroster and it puts out heat. Then, I cranked up the temp to HI and the fan to max, which resulted in heat coming out the vents. When I lowered the temp to 72F, it was almost cold. And, it appears the engine coolant temp hovers just below 80C when idling. When driving it, it goes even lower, so I'm guessing that it could be a thermostat. Given that the coolant was flushed about 2 years ago, and it's not showing any discoloration, I don't believe anything is clogged (which could result in just the opposite issue), but the thermostat was not changed at that time, I will spend a few bucks and change out that puppy. If that still results in no improvement, I may look into swapping in a used CC unit, or just leave it alone and sell it "as is".
Thanks!
Nick
Thanks!
Nick
