MERCURY GRANDMARQUIS 1986 HAS LITTLE HEAT

  • Tiny
  • mesquite5555
  • 1986 Mercury Marquis

My Mercury Grand marquis 1986 has little heat entering the vehicle. The blower flow seems fine. I tried to temporarily clamp the Radiator inlet hose to the Engine for just about 5 minutes and it did not change the heat temperature. What would be the best first thing to check or do?

Thank you

Monday, January 22nd, 2007 AT 3:06 PM

3 Answers

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

First thing is the ant-freeze. Second is themostat. Third blocked heater core, go to radiator shop and get it high pressure blown out! Do you have real good a/c? Check the blend door for binding or bad servo. How is the radiator temp? Hot on top and cool on bottom is good!

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Monday, March 5th, 2007 AT 2:35 PM
  • Tiny
  • mesquite5555
  • Member

The AC works good. The radiator temp is actually very low. I will take these suggestions you gave into consideration and have a look tonight. Thank you.

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Monday, March 5th, 2007 AT 2:47 PM
  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

A vote would be good! If upper radiator is cold go with thermostat first the clogged radiator!

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Monday, March 5th, 2007 AT 3:26 PM

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