Turning on the heater makes me lose engine power?

Asked by Jan 10, 2011 at 12:03 PM about the 1993 Mercedes-Benz 190-Class 4 Dr 190E 2.3 Sedan

Question type: Maintenance & Repair

Why oh Why is this happening please help me! can it be a problem with the heater

2 Answers


The only thing I can think of is some kind of obstruction in the heater core and/or hoses.

1 people found this helpful.

Does the problem happen whenever you put the fan on, or only when it's up to temperature? If it's all the time then you likely have either an earth problem to the heater blower motor or a knackered battery or alternator. A garage can check the battery and alternator easily enough with a volt meter. If the battery is less than 10v when the engine is off, then the battery is likely the problem, if it's the alternator it will be less than about 13.5 v- 14 v with the engine running. If either is the case you should have the same problem when you switch all the lights on and/or the rear window demister too. (If it's the battery the car will struggle to start - with a half decent battery my 190E's always started straight away). However, the radiator fan on the 190E is driven by a viscous clutch (powered by the engine) rather than an electric fan and therefore loads the engine when it cuts in. If the clutch is knackered, this may cause you problems. However, the fan turns on once the engine temp is up to about 90-100 degress C on the temp gauge. If the problem happens when the radiator rather than heater fan kicks in then the clutch is likely knakcered or the belt could be too tight, causing too much load on the engine and a loss in power. The clutches go after a while (most 190's have had that problem already, if yours is low (below 100K) mileage it might be on it's way out. I'd suspect the battery first, then the alternator, then the clutch..

2 people found this helpful.

Your Answer:

Mercedes-Benz 190-Class Experts

  • #1
  • #2
    Mick Stewart
  • #3
    Victor DeBaie
View All

Related Models For Sale

Used Mercedes-Benz E-Class
392 Great Deals out of 19,491 listings starting at $1,913
Used BMW 3 Series
1,038 Great Deals out of 30,181 listings starting at $900
Used Mercedes-Benz C-Class
645 Great Deals out of 25,492 listings starting at $1,100
Used Mercedes-Benz 300-Class
168 listings starting at $3,995
Used Mercedes-Benz SL-Class
63 Great Deals out of 2,900 listings starting at $4,930
Used Mercedes-Benz S-Class
149 Great Deals out of 6,694 listings starting at $1,000
Used Ford Mustang
296 Great Deals out of 39,978 listings starting at $1,312

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.