How does my heater work in 1991 cadillac deville

Asked by Feb 19, 2013 at 03:05 PM about the 1991 Cadillac DeVille

Question type: Maintenance & Repair

2 Answers

35,665

Engine coolant runs through a heater core (mini radiator inside the dash with engine coolant in it). Air is pulled across the heater core using its heat to warm the air. The cars heater can only blow air as hot as the engine, if the engine is cold then you will have no heat.

35,665

Since its a caddy it may have a vacuum controlled valve that allows coolant to pass through the heater core. If the vacuum diaphragm has a small tear in it then it won't open fully and the car will blow cold or almost warm.

1 of 1 people found this helpful.

Your Answer

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,250
  • #2
    Js08016
    Reputation
    1,960
  • #3
    Cynthiasmith
    Reputation
    1,750
View All

Related Models For Sale

Used Lincoln Town Car
26 Great Deals out of 1,710 listings starting at $1,099
Used Lincoln Continental
17 Great Deals out of 3,420 listings starting at $32,794
Used BMW 7 Series
120 Great Deals out of 5,193 listings starting at $1,750

Used Cars For Sale

2005 Cadillac DeVille For Sale
240 listings starting at $2,495
2003 Cadillac DeVille For Sale
174 listings starting at $2,499
2002 Cadillac DeVille For Sale
188 listings starting at $5,900

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.