Merc Cougar has very little heat

Tiny
JOELANDREW
  • MEMBER
  • MERCURY COUGAR
I have a 99 cougar that I'm having a problem with the amount of heat that will come out now that it is cold outside. On the lowest fan setting the heat comes out hot, as it should. On the second setting it blows a little less hot and on the third setting it is warm at best. On the highest fan speed setting the air is cold. This happens on all settings, vent, feet, defroster, it's all the same. Is it possible that the heater core could be partially blocked and only flowing a small amount of coolant through it? Could the thermostat be causing this? The coolant temp gauge is not running hotter or colder than it usually does, the level of coolant in the overflow tank is good. There is no radiator cap on this model car, the overflow tank has a pressure cap, so I can't check the coolant level in the radiator itself. The first fan setting doesn't cut it now that it is 15 degrees outside.
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Monday, December 4th, 2006 AT 8:29 PM

3 Replies

Tiny
MERLIN2021
  • EXPERT
Is this couger equipted with auto temp control?
You can check the water shutoff valve on the heater inlet hose. See if the hose is hotter before the valve than after it. If yes change the valve, you can also disconnect the vacuum hose or electrical connector to it and move the lever.
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Tuesday, March 6th, 2007 AT 3:26 PM
Tiny
MARYINTAMPAFLORIDA
  • MEMBER
Not to be funny, but maybe Mercury didn't intend forthe heaters in Cougers to work.

I've had three Cougers, now a '97, and the heat has not worked in any of them (two were new).

MY SOLUTION:
I used the AC and turn the fan on high. It works perfect.
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Sunday, July 22nd, 2007 AT 8:24 AM
Tiny
PILEAUNICKLE
  • MEMBER
I had the same problem with my cougar.
I flushed the coolant and the heater doesnt blow hot air anymore.
After beating my head for weeks trying to figure this out and asking several different mechanics I found the solution.
On the back of thermostat housing is a hose with a splice in it. You need to remove 1 clamp, pull the hoses apart and open the overflow tank. When you first seperate the hoses you should hear air escaping. Once coolant is flowing from each hose put them back together and your heat problem should be fixed.
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Friday, December 7th, 2007 AT 10:50 PM

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