rescueranger

iTrader: (15)

when im running my car and i got the heater blasted all the way .. im getting little to no heat at all .. i know its kinda cold outside right now .. but its very strange that im not getting heat .. what could be the cause of this? the only thing i know for a fact thats not connected properly is the rubber hose going between the air pump and the air intake pipe .. any help would be appreciated

yuichiror

iTrader: (1)

The heater only really works when you set the air to flow to the floorboards or to defrost the windshield. Either setting should keep you toasty warm!

rescueranger

iTrader: (15)

yeah but its not .. thats the problem .. even when its set to any settings .. floor or windshield

yuichiror

iTrader: (1)

Maybe the heater core is blocked so that coolant isn't flowing through it or you have some other coolant issues..... Sorry I can't be more helpful.....

73828793

my heater core was plugged with gunk. i ran water backwards through it and all was good once again......

Buzzardsluck

i think mine shoots flames from the vents, had a little hair missing on my right calf the other day

bajaman

Mine USED to be 'nuclear' but I plugged the core up with the block seal in a can trick...dammit!
Now it just is barely, barely even lukewarm. And changing the core is a bitch. As the FSM says for step one:

"REMOVE THE DASH"

**** Me!

willjs7

iTrader: (1)

mines not too hot... any faq on how u can clean the gunk out?

73828793

first i would verify that the heater core is clogged. squeeze the return hose from the heater core, if there is no fluid in the line then it is clogged. if it is indeed clogged like mine was get a piece of pipe that will fit inside of a garden hose and the return hose that connects at the base of the filler neck. now disconnect the feed hose to the heater core at the firewall to the side of the ABS unit. turn on water to the hose with moderate pressure and if your lucky you will see the gunk being blown onto the firewall......... oh yeah please do this while the car is cold.........

rescueranger

iTrader: (15)

cool ill check the heater core this weekend

rescueranger

iTrader: (15)

uhm .. where is the heater core located? and what does it look like?

SiKoPaThX

iTrader: (2)

You guys do have the A/C button off right?

quicksilver_rx7

Even if he doesn't, that's not going to make a difference. In fact, it's recommended to turn the compressor on ocassionally to keep the seals from drying out during the winter months when the a/c is not used.

rescueranger: Have you checked your coolant level? Does the add coolant buzzer come on? Low coolant will cause you to have no heat. A thermostat that is stuck open will cause the same problem because the coolant flows through the system too fast.

Also, have you given the car time to warm up before concluding that there is no heat? I know it's sounds dumb to ask, but you'd be surprised.

Joe

HKS7fanatic

sorry to hijack ur thread but im having the same issues. quicksilver_rx7, how can u tell if the thermostat is staying open? also where exactly is the heater core in a 93? thanks guys

quicksilver_rx7

The heater core is on the passenger side, and according to the shop manual (never had to replace one personally) the dash has to be removed.

As for the t-stat, basically if water is flowing before the car is up to "normal operating temperature" then you can guess it's stuck open. Conversely, if the car is "warm" and water is NOT flowing, then it is stuck close.

I don't know the specific temperature at which the t-stat opens off the top of my head, but I'm sure it's on this forum somewhere. The best way to test it, is to remove it and place it in hot water on the stove. But by then, you might as well just go ahead and replace it since you're already in there.

Joe

DaveW

180F is the nominal stock T-stat opening temperature. It opens gradually starting around 175F and should be fully open by ~200F, IIRC.

rescueranger

iTrader: (15)

the coolant buzzer has not come on .. i will recheck the coolant levels .. but i think theyre fine .. last time i flushed my coolant .. i did top it off .. and burped the system

ill recheck to make sure the thermostat is not stuck open

and i came to the conclusion of theres no heat after running the car for bout 30 mins

jpandes

:
My Heater core got plugged up right after the installation of my rebuilt motor. I'm guessing the engine sealer used is now blocking the HC. I have learned to do with out heat. Luckily it doesn't get too cold in SF

73828793

try pumping water through the Heater core backwards to unplug it.......... worked for me.............. i described how to do it a few posts up.

tcb100

Before you get into the pain-in-the *** stuff, I cast another vote for the Quicksilver/Aces High solution.

Check your coolant level first & make sure it's burped. That is the most frequent cause of "no heat" across all car makes & it's easy to do.

73828793

easiest way to confirm a clogged heater core is to squeeze the return line from the heater core, mine had no fluid what so ever in the line. took me a whole 30 mins to flush out my heater core and refill my coolant system. with my coolant leaks and all i still have heat and i always get the low coolant buzzer daily due to this, but goes away after i drive a short distance, but i always top it off once a week.

HKS7fanatic

how can you tell if its already open? how can you tell if its stuck open and water if flowing through constantly?

Skeltah

I had the same problem 2 years ago.. Eventually, my car over heated from a Stuck T-Stat.. Luckily It happend in my driveway and I was able to shut it down. I would bet the farm that you are having the same problem. Change the thermostat out asap.