I don't drive the car in the winter, but I would like to fix this, I have no heat, it just blows cold air, the lined into the core are cold, coolant is full, upper rad hose is warm, but I don't feel a big surge if I pinch it, can a bad water pump cause this? is there anything else I can look at?









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Possibly thermostat stuck open, hose from engine to core and upper radiator should be hot to the touch...ie 200 degrees

 

Replace thermostat. Get one rated at 195 degrees. Once replaced, report back. also list type of Cad in your profile signature. Eldo, Seville, etc.

 

replaced thermostat, no change, 84 deville is what it is.

 

Remove the glove box liner. You will see a threaded metal rod attached to a white plastic arm. As temperature changes and the climate system is on, the arm will move the rod allowing heated air into the cabin. To verify, start car, in "auto" mode, change the display from 60 to 90 degrees. You will see the rod move away towards the firewall at 60 degrees and towards you at 90 degrees. This arm should move slowly and smoothly and take a couple on min. to fully react. If the rod does not move or is jerky, the climate control module needs replaced. Thats the large black box the plastic arm comes out of. The rod simply moves the blend door in the dash much like sliding the lever in a manual heat/A/C system. Verify the rod movement and report back.

 

If the water pump was bad, the car would overheat. You make no mention of overheating.

May I assume that you meant "THE lines into the heater core are cold" ? ? ?

When was the coolant changed? if longer than two years, I suggest you jump on that ASAP.
Have you checked the arm and control module that carnut suggested?
Have you back flushed the heater core?
Has the heater ever worked since you bought the car? (is the core connected?)
Does the A/C work, meaning it blows ice cold air?



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the car has not overheated

yes the lines into the core

coolant is new, not fushed though

heater has never worked

AC works fine

I have owned the car for about a year but have only put 300 miles on it. I will try what carnut said and let you know. Thanks

 

Status ?

 

We dont his age, so hopefully he's still alive? Maybe he froze??

 

Or went fishing?