GOT HEAT ... I DONt
Thread Starter
Full Member
Joined: Apr 2001
Posts: 227
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From: Virginia
GOT HEAT ... I DONt
I had my dash out and decided to go ahead and fix the heat. I had no head and or AC so.......
I started with the basics and endedup doing the logincon fix. The only thing that I could see that the logicon was doing was engaging the air mix motor. So i fixed that. No the AMM works fine. I have hot water flowing in and out of the heatcore unit. And all the little doors and the fans seem to work but still no heat. I noticed that the AMM connects to what looks to be a valve that allows hot watter though the radiator..... So is it possible that that valve is whats failing. I mean the controll arm for the valve works fine. I just cant get any heat....
what should i test next????????
TIA
GZ
I started with the basics and endedup doing the logincon fix. The only thing that I could see that the logicon was doing was engaging the air mix motor. So i fixed that. No the AMM works fine. I have hot water flowing in and out of the heatcore unit. And all the little doors and the fans seem to work but still no heat. I noticed that the AMM connects to what looks to be a valve that allows hot watter though the radiator..... So is it possible that that valve is whats failing. I mean the controll arm for the valve works fine. I just cant get any heat....
what should i test next????????
TIA
GZ
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
I'm pretty sure that the water valve is the only thing that controls the coolant flow through the heater core. If you are getting coolant through the core, then the valve works. BTW, how do you know that you are getting coolant flowing through the heater core?
If you did not buy the car new, note that it is very common for racers to plug the heater hoses. One runs from below the oil filter to the fire wall, and the return line goes from the fire wall to the bottom of the radiator where the lower water pump hose attaches. Any plugs will be obvious.
How about the blower motor? Does air blow out of the vents when you move the lever from OFF to MAX? The blower motor on my 88 locked up at about 90K mi. All I had to do was clean it out, relubricate it, and it works fine to this day.
I don't mean to insult you with these basic checks, but I think that your heater should work based on everything that you have done, and sometimes it's the little things that get overlooked.
If you did not buy the car new, note that it is very common for racers to plug the heater hoses. One runs from below the oil filter to the fire wall, and the return line goes from the fire wall to the bottom of the radiator where the lower water pump hose attaches. Any plugs will be obvious.
How about the blower motor? Does air blow out of the vents when you move the lever from OFF to MAX? The blower motor on my 88 locked up at about 90K mi. All I had to do was clean it out, relubricate it, and it works fine to this day.
I don't mean to insult you with these basic checks, but I think that your heater should work based on everything that you have done, and sometimes it's the little things that get overlooked.
Thread Starter
Full Member
Joined: Apr 2001
Posts: 227
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From: Virginia
Thanx for the post
I had my dash off so it was easy to tell if hot water was flowing.... on the back of the heat core there are 2 copper pipes one is the inflow one was the out and they were both hot.....
as far as the fan yes if blows great.....
it doesnt make any sence to me at all.....
THANX
as far as the fan yes if blows great.....
it doesnt make any sence to me at all.....
THANX
Thread Starter
Full Member
Joined: Apr 2001
Posts: 227
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From: Virginia
Got HEAT --- I DO !!!!!!
I dont kow what happened i went back this morning and it works fine.....
After Cold Solder fix, rebuils AIR MIX MOTOR and flush heatercore...
But it works........
YEA!!!!!!!!!!!!!1
NoW back to finding pieces for my interior ( A DASH) for starters
After Cold Solder fix, rebuils AIR MIX MOTOR and flush heatercore...
But it works........
YEA!!!!!!!!!!!!!1
NoW back to finding pieces for my interior ( A DASH) for starters
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
Oh good, I was just getting ready to look for my service manual.
Hehehe, sometimes things are easier to figure out after you have taken a break.
What kind of dash are you looking for?
Hehehe, sometimes things are easier to figure out after you have taken a break.
What kind of dash are you looking for?
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
Originally posted by gr0undz3r0
Black or gray for my 87 gxl w/o cracks
hehehe
i need alot on inside peices let me know if you have anything black or grey you wanna sell.
thanx for the help....
Black or gray for my 87 gxl w/o cracks
hehehe
i need alot on inside peices let me know if you have anything black or grey you wanna sell.
thanx for the help....
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Passenger
Posts: n/a
OK guys........I am the proud new owner of an 86' RX-7 and I also have no heat. I just bought the car about two weeks ago and this morning on my way to work it was a little chilly so I decided to try out the heater. It doesn't work. The A/C works fine (nice and cold), the blower blows just fine, and the heater hoses are not plugged. Still no heat. Car runs alittle less than halfway on the temp gauge and I know that the coolant is plenty hot enough to heat up the heater core, but I don't know if it is getting through. Anyone have any ideas??
Passenger
Posts: n/a
OK. I went to the link in one of the above messages and read up on the logicon cold solder joints issue and I am going to pull the logicon and the clock module (my clock keeps going back three hours??) this weekend. I work at an electronics facility and I will have one of the techs re-solder all of the joints on the circuit boards Monday of next week(they have all of the fancy temperature adjusting soldering equipment) . As far as the Air Mix Motor I didn't find much on that, but hopefully the first fix will solve the problem. Thanks for replying to this problem, I just got the car and man I'm telling you this thing RUNS!!!! I have always liked working on cars but I have never owned an RX-7 let alone a Mazda. As long as the fixes don't involve an expensive internal engine repair, I think this car is going to be around for a long time to come. Anyway, I'll try to keep you posted after the weekend to let you know how it turns out........ EDIT Why do the words Exhaust Leak appear under my screen name?? I tried editing my profile and I can't see why that keeps showing up. LOL
Junior Member
Joined: Apr 2004
Posts: 19
Likes: 0
From: Toronto
Originally Posted by gr0undz3r0
I would say (from my own exp) your going to have to do the Air Mix Motor Fix and the Logicon Cold Solder Fix...
If you want some help let me know.
If you want some help let me know.
Hey.. I just posted a thread and then started to read this... I'm not familiar with those fixes, this is my post....
I'm freezing, I need heat!!!
--------------------------------------------------------------------------------
Just wondering if anyone has any troubleshooting tips for fixing my heat in my 87' RX7. I took it over to a local shop that works on my car every once and a while and they were giving me the old, "Oh.. lotsa work here" and didn't seem like they wanted to help me. The one dude there figured it's the hot / cold selector not switching, but that seems odd to me. He said that the hold / cold selector is run by a small motor which opens and closes the door to allow hot air in... He thinks that the door is stuck in the cold position. My blower motor is brand new and is pumping cold air in with a very small trace of heat when my car is parked. The second I start moving the air through the front end turns that trace of heat into freezing cold air. The dude at the shop was sayin' that he'd have to take the dashboard out and the console to see if he could manually switch the door and check if the motor is working..I'll do the work if that's the case, but for some reason I don't think that if the door was jammed only letting cold air through, that I would feeel as little heat as I do. (you'd figure the heat would push it's way through a bit more then that.) But I dunno... Please help me as it's gonna be another very cold Canadian winter. Brrrrrrrrrr.....
But after reading this post I'm now wondering if it's this Air mix motor??? or Logicon???? PLEASE HELP ME!!! I'M FREEZING!!!!!
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