Help! No heat?!
Thread Starter
Junior Member
Joined: Jul 2018
Posts: 54
Likes: 1
C63 AMG P30
Help! No heat?!
Help!
Its cold as **** here in the midwest and I have no heat.
At the same time this issue started -- check engine light came on, codes: P0116, and P0128.
The car runs fine -- and coolant does come up to temp 180-200F w/in 15 min of driving --- oil temps on the other hand do not get above 150 even on a 40 min commute.
My initial thought was thermostat? But could it be something else?! My other thought was if we have some sort of heater control valve -- as the car is warming up somewhat quickly -- and prior to this issue in the extreme cold it would take quite some time to come up to full warm -- however -- I can not find a part # or anything for this.
Lack of heat is evident when it is very cold, @ milder (20 degree + temps) its not as bad, but in the -20 we've had here recently in Michigan, which is when this problem first arose -- its brutal.
Thanks in advance!
Car is a W204 C63 AMG P30 (2009).
Its cold as **** here in the midwest and I have no heat.
At the same time this issue started -- check engine light came on, codes: P0116, and P0128.
The car runs fine -- and coolant does come up to temp 180-200F w/in 15 min of driving --- oil temps on the other hand do not get above 150 even on a 40 min commute.
My initial thought was thermostat? But could it be something else?! My other thought was if we have some sort of heater control valve -- as the car is warming up somewhat quickly -- and prior to this issue in the extreme cold it would take quite some time to come up to full warm -- however -- I can not find a part # or anything for this.
Lack of heat is evident when it is very cold, @ milder (20 degree + temps) its not as bad, but in the -20 we've had here recently in Michigan, which is when this problem first arose -- its brutal.
Thanks in advance!
Car is a W204 C63 AMG P30 (2009).
Senior Member
Joined: Feb 2018
Posts: 339
Likes: 108
From: Virginia USA
2016 GTs, 2014 C63 AMG and 2014 C350 Sport (wife's car, she thinks it's an AMG - shhhhhh)
I was going to ask the same thing but even without the blower some heat would make its way to the vents, no? From what he describes the vents are cold which would indicate that air isn't getting routed through the heater core at all.
Thread Starter
Junior Member
Joined: Jul 2018
Posts: 54
Likes: 1
C63 AMG P30
the fan does blow/and everything works as far as far as the various settings, air coming through the vents is not the same temp as external but it’s definitelt not warm.
Junior Member
Joined: Jan 2018
Posts: 46
Likes: 12
From: Ft. Sask. Alberta
2014 C63 507 Edition
Somethings messed up with the control doors that direct the air flow across the heater coil. Here's a good article to explain it:
https://driving.ca/auto-news/news/ho...heating-system
https://driving.ca/auto-news/news/ho...heating-system
Thread Starter
Junior Member
Joined: Jul 2018
Posts: 54
Likes: 1
C63 AMG P30
Somethings messed up with the control doors that direct the air flow across the heater coil. Here's a good article to explain it:
https://driving.ca/auto-news/news/ho...heating-system
https://driving.ca/auto-news/news/ho...heating-system
Any idea what the engine codes mean? Assuming it means thermostat replacement ? Would that have a thing to do w/heat ... the car still comes up to temp (coolant), but the fans run from start up and continue to run for a few mins afterwards at full blast as well
Super Member
Joined: Apr 2014
Posts: 681
Likes: 231
From: SC
2010 C63 AMG RIP. 2021 Toyota Tacoma TRD Off Road, 2013 C63 coupe
My bet is that your thermostat is stuck open or a bad engine coolant temperature sensor. Give the thermostat a little tap with a rubber mallet to see if it comes unstuck.
I had that on my e46 M3 after driving it and letting it sit on a very cold winter night.
Your symptoms are leading me to an open thermostat. your coolant might get to operating temp (15min seems to be too long to me). but your engine oil isn't. Which tells me that all or most of the coolant is going through the radiator and is cooling your engine and the oil in the engine too soon.
What seems unclear is why your heater isn't blowing warm air as it should not even after 15min unless the sensor is bad as well.
P0116 Engine coolant temp sensor range/performance problem.
P0128 Coolant below thermostat regulating temperature.
I had that on my e46 M3 after driving it and letting it sit on a very cold winter night.
Your symptoms are leading me to an open thermostat. your coolant might get to operating temp (15min seems to be too long to me). but your engine oil isn't. Which tells me that all or most of the coolant is going through the radiator and is cooling your engine and the oil in the engine too soon.
What seems unclear is why your heater isn't blowing warm air as it should not even after 15min unless the sensor is bad as well.
P0116 Engine coolant temp sensor range/performance problem.
P0128 Coolant below thermostat regulating temperature.
Last edited by sventastic82; Feb 3, 2019 at 06:12 PM.
Trending Topics
Thread Starter
Junior Member
Joined: Jul 2018
Posts: 54
Likes: 1
C63 AMG P30
My bet is that your thermostat is stuck open or a bad engine coolant temperature sensor. Give the thermostat a little tap with a rubber mallet to see if it comes unstuck.
I had that on my e46 M3 after driving it and letting it sit on a very cold winter night.
Your symptoms are leading me to an open thermostat. your coolant might get to operating temp (15min seems to be too long to me). but your engine oil isn't. Which tells me that all or most of the coolant is going through the radiator and is cooling your engine and the oil in the engine too soon.
What seems unclear is why your heater isn't blowing warm air as it should not even after 15min unless the sensor is bad as well.
P0116 Engine coolant temp sensor range/performance problem.
P0128 Coolant below thermostat regulating temperature.
I had that on my e46 M3 after driving it and letting it sit on a very cold winter night.
Your symptoms are leading me to an open thermostat. your coolant might get to operating temp (15min seems to be too long to me). but your engine oil isn't. Which tells me that all or most of the coolant is going through the radiator and is cooling your engine and the oil in the engine too soon.
What seems unclear is why your heater isn't blowing warm air as it should not even after 15min unless the sensor is bad as well.
P0116 Engine coolant temp sensor range/performance problem.
P0128 Coolant below thermostat regulating temperature.
thanks! I have a new thermostat so just going to replace it! Although giving. It a womp with a mallet would be such an easy solution !! it did happen after a very very cold night. Where is the engine coolant temp sensor located? Is this an easy DIY?
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Super Member
Joined: Apr 2014
Posts: 681
Likes: 231
From: SC
2010 C63 AMG RIP. 2021 Toyota Tacoma TRD Off Road, 2013 C63 coupe
