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Old 12-29-2013, 06:07 AM   #1
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Overheating

So my '91 overheats very easy and I'm constantly having to put water in it. Doesn't drink the coolant as fast idk how it's doing that. When I bought her the previous owner has the hood scooped sealed off I don't know y but I'm prolly going to take it off and see if that helps. But in case there's more to keepin my temp at 190 would very helpful. Ill post pics of hood to show what I mean by the seal soon as I get off work. Thx!
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Old 12-29-2013, 09:39 AM   #2
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The hood scoop will have nothing to do with overheating.its for looks.sounds like water pump or radiator.do you see anything leaking when you put water in it?
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Old 12-29-2013, 10:33 AM   #3
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No leakage anywhere. It only starts to over heat in heavy traffic and im back and forth between 1st and 3rd gear, and of course during the summer it's almost impossible to drive during the day. I was thinking the scoop could improve it cause the intake is only getting air from under the engine.
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Old 12-29-2013, 10:36 AM   #4
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Old 12-29-2013, 10:38 AM   #5
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Old 12-29-2013, 11:48 AM   #6
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The intake should be getting air thru the throttlebody not the engine bay.sounds like water pump to me or a stopped up radiator
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Old 12-29-2013, 01:05 PM   #7
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+1 Liebert91 Stag
Either water pump, radiator clogged or air trapped in the system. Could be a bad thermostat also

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Old 12-29-2013, 01:08 PM   #8
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Ima flush the radiator at least that won't hurt anything I haven't done it since I've bought the car anyways. I don't think it's a bad thermostat cause when it does overheat and I go to turn off the car she makes a rattling noise, jerks a little then turns off.
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Old 12-29-2013, 01:54 PM   #9
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If it were me I'd flush out the whole coolant system.
There is a possibility that the heater core restrictor has become clogged and not letting the coolant circulate through the whole system.
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Old 12-29-2013, 06:09 PM   #10
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I don't understand how it uses the water, but not the coolant? Those should be mixed appropriately...else that can cause issues. I would flush, replace thermostat while system is open, possibly drill holes in thermostat, double check for leaks. If radiator and fan are good, it is either not circulating fluid or t-stat is no good. I'm thinking t-stat.
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Old 12-29-2013, 10:02 PM   #11
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+1 Sgt_Syke

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Old 12-29-2013, 11:43 PM   #12
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I don't get it either. I guess this will have to be a weekend project then.
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Old 12-30-2013, 12:26 AM   #13
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Ill test the tstat first, go from there ill flush the cooling system anyways I'm sure it needs it regardless. Overheating can cause gasket leaks too I may as well check for those while I'm under the hood anyone know any tricks to making sure I have no gasket leaks?
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Old 12-30-2013, 02:06 AM   #14
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Take out not test* stupid auto correct
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Old 12-30-2013, 05:52 AM   #15
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Testing gaskets in a job. I wld check for fluid leaks around the heads. But get the engine warm first. If its gonna leak it will be when its hot. Also, u can pressurize the system by renting the pressure tester from Advanced Auto or Auto Zone. Are u seeing any excessive condensation from ur exhaust tips? What about in ur oil, any milky like substance on ur dipstick while engine is hot? Cld be a cracked head. I wld change the thermostat first. Ur heater core cld have a blockage also. Flush the entire system is always a good idea anyways. Keep us posted on what u find

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Old 12-30-2013, 12:01 PM   #16
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No excess condensation, no milky substance either. I flushed the cooling system bout to put radiator back in. Having trouble getting to tstat what's the best tool to get down in there
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Old 12-30-2013, 12:52 PM   #17
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Hmmmmm it shld fall right out. Thermostat is right in the front. Take the elbow off and shld come right out

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Old 12-30-2013, 01:43 PM   #18
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When installing the Tstat make sure you have it faced the right direction and that you use a new gasket.
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Old 12-30-2013, 02:03 PM   #19
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Is it possible that tstat is missing? As mentioned it should be right at elbow.
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Old 12-30-2013, 03:07 PM   #20
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Ok this explains my passenger side floor being wet I'm thinking now it's definitely my heater core

---------- Post added at 04:07 PM ---------- Previous post was at 04:04 PM ----------

Yea I got it out already sorry. Auto zone ordered me another should be there in two days or so. But as for my heater core I'm thinking its blocked or something. I thought my windows were leaking and that's how my floor kept getting wet but my seats stay dry so I'm thinking there's a problem but I've never changed one out. How would I even begin to get the dash off
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Old 12-30-2013, 03:18 PM   #21
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Yep it definitely sounds like your heart core is gone if you're seeing signs of steam on the inside of your window.

If you plan on doing the heat core replacement yourself this is a great link to follow when doing the heater core.
79-93 Mustang Heater Core Removal/Install - LatemodelRestoration.com

And make sure you have the flow restrictor in the inlet tube/ hose.
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Old 12-30-2013, 03:43 PM   #22
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Alright preciate the info and the site ill post the results in a few days
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Old 12-30-2013, 04:35 PM   #23
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The Restrictor goes here.


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Old 12-30-2013, 07:34 PM   #24
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The restrictor is that a piece that's causing all this?
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Old 12-30-2013, 09:27 PM   #25
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It's actually not that hard. That is definitely heater core though. You have to disconnect supply and return lines going through firewall to heater core, there should be fluid coming out so use bucket. Then lower the steering column, take off the dash pad (screws around top by vents) unbolt the dash on both sides by the kick panels...can't remember if there are other bolts, probably I'm forgetting some. If you can remove the dash it's easier access, but if not swing it out from passenger side. The heater core is inside of black plastic box. Open the box, pull out core, then reverse the process.
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Old 12-30-2013, 09:59 PM   #26
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Quote:
Originally Posted by Foxbody91 View Post
The restrictor is that a piece that's causing all this?
It's a possibility that the restrictor could be causing the problem but more than likely the heater core is just wore out and leaking.
The restrictor is designed to reduce the pressure of the coolant (particularly during hard acceleration and deceleration) through these cars' relatively fragile heater cores.
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Old 12-31-2013, 12:28 AM   #27
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Quote:
Originally Posted by ALMOST STOCK View Post

It's a possibility that the restrictor could be causing the problem but more than likely the heater core is just wore out and leaking.
The restrictor is designed to reduce the pressure of the coolant (particularly during hard acceleration and deceleration) through these cars' relatively fragile heater cores.
Bypass the heater core with a piece of pipe ( link the two hoses that enter the firewall together if you cant replace the heater core right away). I did it for a few months without a problem.
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Old 12-31-2013, 08:12 AM   #28
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Also I forgot to mention you will need to remove center console. Small screws in center console, under parking brake, and near ashtray up front.
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Old 12-31-2013, 08:14 AM   #29
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Ok thx again will post results in few days
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Old 12-31-2013, 09:54 AM   #30
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Not sure. Never changed one. Had someone tell me to just retract or remove the passenger seat yo make it easier. I am positive if ur floor is wet that your heater core is the culptit though

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Old 12-31-2013, 08:51 PM   #31
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Quick fix is just loop it back just bypass the heater core
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Old 01-03-2014, 12:12 AM   #32
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Any luck fixing it OP?
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Old 01-03-2014, 12:19 AM   #33
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I've got center console out. That's all I've been able to do the weather here has been horrible hopefully tomorrow will be clear long enough for me to at least get dash off
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Old 01-03-2014, 10:13 AM   #34
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Once you start removing the screws in the dash make sure you mark them so that they go back in the same place .
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Old 01-04-2014, 08:50 AM   #35
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Alright core is replaced. Stains on my floor are giving me a hard time coming out I guess ill have to replace them. Trying to decide if I want to keep the classic red interior or go black. Car is painted garnet with black rims and tints, the black may go good with the outside
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