Question about 1991 Mazda 626

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My car is heating up ok and the temp gauge moves to the middle of the dial, water is topped up,but when i drive the car the temp gauge moves down to nil...do i need a NEW thermostat ???

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  • 156 Answers

Surely sounds like it. drain & refill with 50/50 coolant-anti freeze

Posted on Nov 09, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 74 Answers

SOURCE: I have a 94 Mazda

check your controls under dash maybe lever or cable has come off or broke to the heat door or recirculate vent/////// if you check the hose going to heater core and the return hose maybe clogged heater core

Posted on Nov 23, 2008

  • 3 Answers

SOURCE: 2000 Mazda 626 LX V6, temp gauge goes dramatically up, then down

the thermostat needs replacing

Posted on Feb 12, 2009

  • 39 Answers

SOURCE: 98 Mazda 626 overheating. Blew off hose and was

Yes, this is most likely a thermostat problem.

As a basic explanation, the thermostat is the device which separates the hot coolant in the engine block from the cool coolant in your radiator. If it gets stuck closed, your radiator coolant will remain at near room temperature, while the coolant in your block (which is what your gauge reads) does not circulate and will skyrocket in temperature.

Posted on Aug 13, 2009

Testimonial: "Very helpful. Discription makes sense/logical explanation of symptoms."

teemossinmia
  • 265 Answers

SOURCE: 2001 mazda 626 where is the thermostat so i can

If you have a 4 cyl. it is located in the front of the motor, on the left hand side, right beneath the exhaust manifold..There is a Hose connected to it...Now if you have a V6, then it is located on the back of the motor, just follow that hose on the top right side of the radiator..you have to take the air filter, and the box out to get to it..

Posted on Jan 19, 2010

  • 1 Answer

SOURCE: My car would not go forward when I put it into drive it rolls bac

Could be the shift cable. Mine broke off a while back and it would not shift into any gear. AAMCO was going to charge me $150 to fix it, but I fixed it myself. The connection at the transmission is on the drivers side of the transmission right below and to the rear of the air filter housing. I would guess it could be stuck in neutral for some reason (maybe last gear it passed through before it broke) but mine was stuck in park. It may not be the problem, but it's a simple solution that's worth looking into.

Posted on Jul 18, 2010

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I have a 2001 1.8 lx mondeo.The temp gauge moves to the middle position when I drive around town, but when I go onto a duel carriageway or motorway the gauge drops back to the cold end, whats going on


First thing comes to mind is coolant level.
Temp gauge only measures temp of water...it can't read air temp.
If there's an air bubble that gets to the temp gage...you will indicate a lower temp.
I'd check for leaks...a water pump just starting to weep can cause up / down readings.

After that I'd look at the thermostat.
An experiment to try:
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If your problem was just the opposite...I'd be sending you to the lower radiator hose.

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I RECENTLY REPLACED THE THERMOSTAT IN A 1996 FORD EXPLORER 4.0 4WD. THE HEAT WAS WORKING FINE AND THE GAUGE STARTED MOVING UP TO HOT AND THEN BACK DOWN TO THE COOL MARK WHILE DRIVING. AFTER COMPLETION I...


i wonder if possibly a defective thermostat, that it is sticking open.
to bench test thermostat place in a pot,if you have a candy thermometer all the better ,place in cool water and bring to boil checking temp.it should open alittle at a time until being fully open at what ever temp it is rated at
then slowly add cold water and it should close in a similar fashion

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