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Could be a lot of things (i.e. thermostat, heater control valve...) Does the temperature gauge reach normal (1/2 way) temps?
Check to see if the control valve is working. Here's one way to do it. On the passengers side, remote the lower panel just under the glove box. Should be a couple of plastic pins holding it in. With the car running at normal temperature, move the hot/cold slider lever to HOT, then to cold slowly and see if the valve (located on top of the heater core) is moving. I "think" the heater control panel is vacuum operated and you may have a split in the plastic hose(s). Listen for a vacuum leak...
Good Luck. I hope this helps.
Check the hard wire that moves the heater damper flap, it often gets bent and will get stuck in one position, hot or cold. Commonly sheathed in a blue plastic ~1/8" tube. Both ends can get bent if there is excessive gunk buildup at the ends or on the lever arms (rust, dirt, dried soda, etc.) They also just come loose after time and slide in the pinch clips that hold them in place. Be VERY careful if it is bent and requires straightening. The wire is strong enough for a few bends, but don't over-do it!
Sorry for your troubles ,
Temperature Hand in dash reading NORMAL ?
Does it Turn Blue to Red if so is do you feel friction or restraint like your turning something rather than freewheeling (smooth fast turning) or Digital and or does it show that it should be warm and not cold ?
Does the TEMP change at all(even the least little bit could narrow the results down) when knob is turned?
POSSIBLE - The Actuator/Motor that switches the VENTS very well could be BAD , Temperature Switch / Climate Control Switch (hot to cold could be broke at the base and only allowing the knob to turn and not in the switch ) Thermostat may be stuck open (keeping the engine running cool and smooth but no heat , maybe just a slight TEMP change when switched from Cold to Hot ). The A/C Switch is pushed in or turned on or broke and is stuck ON
FIXES - 1st- Check FUSES - If Temp HAND Reads Normal it not your THERMOSTAT. - Change the Control Switch / Temp switch - Check A/C Button/Knob . AUTOZONE is my place of business they PRICE MATCH AS WELL!
Hope this Helps , Flaming Ratchets Auto Repair
Are all the vents working? Does your Cruise Control work (properly) it may work and shut off. If your vents are working is only hot air or cold air coming thru, or just your defroster vent?
You have a 3 way check valve under fuel rail guard on passengers side, its a pastic barrel shape thing it rots and creates holes in it causing your ac vents and cruise control to malfunction.
next your heater control unit if you have the one with a slider to regulate the hot or cold temperature breaks easily inside unit, its only plastic. Its an arm inside unit to control the temp in car it slides a door open or closed for heat. If you look where he slider enters thru that hole space you will see a post it sits on to open and close .
For clarification, it seems that you are getting air blown through the system but there is no temperature change, hot or cold?
Your heater control panel is cable operated with sliding knobs, not like the newer electronic controls with push buttons. It is a "mechanical" set up as opposed to an electrical situation.
Does the slider for the temperature control feel like it has tension and is moving mechanisms in the dash somewhere? If not, the cable, which has an "S" curve on the ends, may have slipped out of the arm either behind the heater control panel or at the AC box where the door is. Also, check the heater control valve on the firewall under the hood to see if the arm on the valve is moving properly when the temperature slider is moved.
When you push the "AC" button, do you hear fans under the hood/AC relays click on/idle drop? If not, you may have a separate AC issue, either very low or no freon. If the freon is just a little low, check the sight glass for the freon to see if you see bubbles when the AC comes on.
replace the thermostat,, and make sure that the fan engages , just because the fluids don't boil over doesn't mean the temp isn't to high, if your saying that the temp gauge is stuck on the hot setting, and doesn't move even when the car is cold,, thats a different problem,, if thats the case whats the make , model , and year
Sounds like it is stuck. The location of it is on the passenger side of the motor to the right of the oil filter. Also a good upgrade to your MR2 is to go with a 170 deg thermostat.( TRD) The mr2 comes with a higher temp model witch will run your car hotter. Cooler is better! Good luck!
Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.