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Anonymous Posted on Jun 17, 2017

99 mercury cougar v6 2.5L, temp gauge is reading hot after thermostat change why? is it a air bubble or is it a bad temp. sending unit? any other ideas? please help

99 cougar v6 2.5L has new water pump, radiater, and flush done, everything worked fine. then i just had thermostat changed now my temp. gauge is reading that the car is getting hot but feeling the hood of car it feels cool, so i don't know if my car is really overheating or if my gauge is giving me a false reading we'v tried manually bleeding the system but so far no fix. could this be cause of air bubble or bad sending unit? any ideas? please help

1 Answer

SeabeeMechanic

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  • Cars & Trucks Master 1,367 Answers
  • Posted on Jun 17, 2017
 SeabeeMechanic
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Joined: Apr 22, 2013
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May be a defective thermostat or place in the wrong direction. If it's properly installed, might want to check the fan operation which may be producing the overheating.
If fan is good, one way to remove air in the coolant system is to run vehicle while all heaters on. take extra coolant and stop along the way to top off if needed. While driving, keep listening for the fan to begin running when vehicle reaches high temperatures.
If you continue to experience overheating, may want to take to a local known repair shop for further troubleshooting.

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Mar 01, 2009

SOURCE: temperture gage reads hot heater blows cold air

. make sure valve on hose to heater from radiator is all the way open.

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Anonymous

  • 5 Answers
  • Posted on Apr 29, 2009

SOURCE: 1993 camaro overheating

There is a little hole close to the spool of the water pump, im not sure if its on top or bottom, but once you see that hole start the engine and if water starts leaking out of that hole you need a new water pump.

Håkan Sterner

  • 74 Answers
  • Posted on May 31, 2009

SOURCE: can you bleed the water cooling system on 1999 mercury cougar

This is extremely important on some cars, for instance my BMW. 1. Have the car parked in a slight uphill slope. Make sure there is enough coolant in the expansion jar.
2. Start the engine and wait for the thermostat to open (upper radiator hose becomes warm).
3. Open up the radiator bleeding nipples slightly with a large screwdriver (bleeding nipples normally made of plastic with a '+* for a screwdriver to fit, at the highest points in the cooling circuit).
4. Allow air bubbles to fizzle out until you get a steady stream of coolant leaking out, use rags to capture leaking coolant.
5. Then close the bleeding nipples, switch off the engine and wait a few minutes for pressure to come down.
6. Open up the cap on the expansion vessel carefully and fill just below the "hot" marking.
7. Check levels again after a few miles and refill further if needed.

Done.

dorr221

  • 49 Answers
  • Posted on Aug 31, 2010

SOURCE: 2002 dodge stratus 2.4 litter

get a Haynes manual and see if the water hose has a bleeder screw on a line that is up higher than most.
Usually a small line that runs over the top of the motor. I had this happen on a chevy Malibu and I just had to open the screw while running (but not hot) to bleed the air out of the line.

Anonymous

  • 82 Answers
  • Posted on Dec 26, 2010

SOURCE: 92 Mercury Topaz 6 cyl. Belongs to a friend. The

make sure the thermostat was instaled correctly and not upside down spring on thermostat goes towards motor or block good luck

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I have a 2002 mercury cougar. After the coolant gets to operating temp both my high speed fan and my low speed kick on and stay on for a long period of time sometimes they dont kick off, do i have air in...

It could be you have a faulty radiator fan relay. There could be issues with the thermostat or thermostat housing. The old Cougar thermostat housings weren't built very well and tend to malfunction. Check the by-pass hose from the heater to the intake manifold after the car is warmed up with the heater on to make sure it is hot and coolant is actually passing through. I would just replace the thermostat, relay, and housing and see if that fixes it first. If these things haven't been changed in the last 10 years then they are due for a replacement. Here's a website that has all the parts and good pictures with descriptions: http://www.carid.com/2002-mercury-cougar-engine-cooling-parts/
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Where is the temp gauge sending unit(s) located?

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Normal operating temperature is going to be around 210 F.

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