Incorrect Temperature From Climate Control System on Mazda RX-8

If the climate control's heat/cold knob is not adjusting to the desired temperature, a new climate control unit may be needed.

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Average mileage: 67,013 (20,000–110,000)
7 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010
43 people reported this problem
27 people shared problem details
2005 Mazda RX-845,000
no heat even when turned to high heat you have to wiggle switch to work
6 people like thisFlag inappropiate
I had the same issue where jiggling the knob was the only way to change the temperature. The solution isn't really difficult. It'll take about an hour and a half. You have to remove the radio/climate control faceplate, then disconnect and remove the climate control unit. Disassemble it all the way down to the circuit board. There, the temp control knob will have 3 pins that go all the way through the board. If you look at the back side of the pins you'll notice: 1) There isn't much solder on it, 2) The solder is cracked. Just add more solder to the pins. I used Rosin based. Reassemble and test. Worked like a charm for me. Even if you've never done anything like this before, give it a try. You'd be surprised how easy it is.
4 people like thisFlag inappropiate
2005 Mazda RX-845,000
The heater control is not working...It's winter and all I get is cold air...No heat
4 people like thisFlag inappropiate
2005 Mazda RX-850,000
A/C knob doesnt work. Only goes from 0 to 16 and nothing in between and you have to jiggle it and mess with it to get 16. This is clearly a common problem from the design of the car and should be recalled. Needless to say this and other problems with the vehicle (condensation in the taillights etc.) will make sure I never buy another Mazda. I love the car, but the service and poor design doesnt make it worth it.
2 people like thisFlag inappropiate
2004 Mazda RX-834,000
Hot air with air conditioning, cold air with heat. Wiggle knob and rotate to get correct temp. It sometimes takes a while to get the temp I am asking for.
2 people like thisFlag inappropiate
2004 Mazda RX-861,000
climate control heat not holding setting. Cd player skips
2 people like thisFlag inappropiate
2005 Mazda RX-889,000
Temperature control knob is messed up and you have to twist it back and forth between hot and cold and then hold it on the cold for a second or 2 for it to hold cold.
1 person likes thisFlag inappropiate
2004 Mazda RX-885,000
Solder points break in unit. Resolder connections. About 3 hrs to fix and back to normal. Search Google for pictures and instructions.
1 person likes thisFlag inappropiate
Of course, I bought this car used. It was summer so I tested the AC which seemed to work. The same week I noticed the heat was possessed. It is either super hot, or super cold. There is no in between. It seems to decide when and where it wants to get hot, or to get cold. Usually I can rotate the knob back and forth to fix this. With all these reports, I would think this is a faulty design or manufacturing. I assume there is a recall for this? If not I may just contact a lawyer and see about starting a class action suit. Oh, and today the airbag light literally just came on out of no where. Hey all, found a do-it-yourself guide to fix this problem. I plan on doing it, then sending Mazda a bill for the labor at standard shop rates. :-) http://www.rx8club.com/do-yourself-forum-73/diy-no-heat-repair-heater-control-158200/
1 person likes thisFlag inappropiate
2005 Mazda RX-865,000
Temp control does not work
1 person likes thisFlag inappropiate
2004 Mazda RX-868,500
Sometimes the heater doesn't put out any heat even after the engine has reached operating temperature. After turning the temp.back & forth Sometimes it will start working & Sometimes not!
NO HEAT IM FREEZING
2005 Mazda RX-849,000
My climate controls worked intermediately, including the source (recirc vs. fresh air), location (defrost, feet, etc.), and temperature. Was having issues with the radio display too. Took it in yesterday to an electronics repair shop. They resoldering the entire panel inside the display and now it works perfectly.
2005 Mazda RX-889,056
Cant get the right temp . It stys hot will not go to cold.
2004 Mazda RX-8110,000
Im having cooling issues, the computer says its has something to do with the intake code 661 i think... the car does not heat up it takes time to heat up now. more so the nobs and i would like to install a blue tooth connect no wires or visible outer parts. If it is at a reason reasonable price flat screen. Need free diagnostics of car
2004 Mazda RX-876,000
I ran into the same problem but mine often gets worst the whole thing goes out radio CD player and only two lights flash on the climate control round buttons the green(AC) Orange(Circulation).
2004 Mazda RX-875,000
AC and heat do not adjust according to setting. Will blow hot cold hot cold...
2004 Mazda RX-870,000
Heater does not work unless you wiggle the knob and even then it goes back to cold air... Oh, and the knob broke off as well...
2006 Mazda RX-865,000
I had the same issue where jiggling the knob was the only way to change the temperature. The solution isn't really difficult. It'll take about an hour and a half. You have to remove the radio/climate control faceplate, then disconnect and remove the climate control unit. Disassemble it all the way down to the circuit board. There, the temp control knob will have 3 pins that go all the way through the board. If you look at the back side of the pins you'll notice: 1) There isn't much solder on it, 2) The solder is cracked. Just add more solder to the pins. I used Rosin based. Reassemble and test. Worked like a charm for me. Even if you've never done anything like this before, give it a try. You'd be surprised how easy it is.
2004 Mazda RX-890,000
Erratic temperature fluctuations. Wiggle knob or wires behind (up through the ashtray door). Have not repaired.
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