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11-28-2016, 10:31 PM
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#1
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Registered Member
Join Date: Jul 2013
Location: Bladensburg ,Md
Region: Maryland
Posts: 42
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87 mustang gt overheating?
Have a 87 recently while driving started to over heat check it out top hose was cold I assume the thermostat wasn't opening got a new one still the same issue need some help
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11-29-2016, 05:23 AM
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#2
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Registered Member
Join Date: Jan 2011
Location: Aiken
Region: South Carolina
Posts: 3,274
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I'm not as familiar with the older 302, but if the tstat is new, and you've flushed the system and checked flow blockage, I'd be leaning towards either a failed or on its way out water pump. But definitely check the radiator first.
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11-29-2016, 07:02 AM
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#3
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Registered Member
Join Date: Aug 2013
Location: Colorado
Region: Colorado
Posts: 679
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A few questions: What's your engine, water pump and fan setup? How were you driving - higher rpms, highway, traffic, etc? Are you determining that you are overheating because of the gauge only? Is this situation repeatable every time? Did you drill a small hole in your t-stat before installing for air to escape?
Personally I would start by letting it sit at idle as it heats and wait for it to reach temp. If everything works as it should once hot, you might be having lower hose collapse at higher rpms. If you still overheat at idle, that points to your thermostat, or a blockage or serious amounts of air in your system.
Let us know what you find out
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11-29-2016, 10:57 AM
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#4
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Registered Member
Join Date: Jul 2013
Location: Bladensburg ,Md
Region: Maryland
Posts: 42
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302 with stock radiator and stock fan and water pump the antifreeze keeps running to the overflow bottle and not the thermostat
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11-29-2016, 10:57 AM
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#5
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Registered Member
Join Date: Jul 2013
Location: Bladensburg ,Md
Region: Maryland
Posts: 42
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Ok will do
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11-29-2016, 11:46 AM
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#6
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Staff
Join Date: Aug 2013
Location: Small Town
Region: Connecticut
Posts: 5,091
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thread merged!
Mud
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2012 V6 traded for a 2017 VW GTI
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11-30-2016, 01:01 AM
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#7
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Registered Member
Join Date: Aug 2013
Location: Colorado
Region: Colorado
Posts: 679
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Quote:
Originally Posted by Project Pony
I'm not as familiar with the older 302
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Haha, I was gonna say I'm not as familiar with the newer mustangs...
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11-30-2016, 01:07 AM
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#8
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Registered Member
Join Date: Aug 2013
Location: Colorado
Region: Colorado
Posts: 679
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One other thing to be aware of, if your rad cap isn't holding pressure, that will lower the boiling point, and could cause it to overflow into the tank. Probably not the problem since your upper hose stays cool, but I just wanted to mention it.
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12-03-2016, 04:21 PM
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#9
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Registered Member
Join Date: Jul 2013
Location: Bladensburg ,Md
Region: Maryland
Posts: 42
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Quote:
Originally Posted by Project Pony
I'm not as familiar with the older 302, but if the tstat is new, and you've flushed the system and checked flow blockage, I'd be leaning towards either a failed or on its way out water pump. But definitely check the radiator first.
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Just flush the system upper hose got hot finally but the still no heat and the car started to run hot again
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---------- Post added at 05:21 PM ---------- Previous post was at 05:21 PM ----------
Quote:
Originally Posted by ER12883
One other thing to be aware of, if your rad cap isn't holding pressure, that will lower the boiling point, and could cause it to overflow into the tank. Probably not the problem since your upper hose stays cool, but I just wanted to mention it.
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Just flush the system upper hose got hot finally but the still no heat and the car started to run hot again
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12-05-2016, 02:39 PM
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#10
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Registered Member
Join Date: Mar 2014
Location: Miami
Region: Florida
Posts: 1,343
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So pretty much stock everything I see. Did this just start happening? How long have you had this car? How long has it been running right before this started to happen?
Ok so you are going to need a good mechanical gauge to see where and when the temps are shooting up.
So your checked and the tstat is good?
Proper level of coolant?
Flushed very well and no obstructions?
Bottom hose not collapsing?
Did you burp the coolant system? Did you jack up the car when you burped it?
Also do a pressure test. You can get this from the Auto Parts store for free.
Finally when you are burping the system and you keep seeing bubbles and more bubbles it might be a head gasket which is causing the overheating.
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2016 VW GTI 2.0 Turbo
1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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12-17-2016, 08:26 PM
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#11
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Registered Member
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 289
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One thing you can check,related to the heater,is the heater hose.81-88 models,the 93 Cobra & police intercepter Mustangs came with a metal coolant flow restricter in the larger heater hose.Since its passage is smaller than the heater hose passage,corrosion can clog this restricter easier than it can clog the heater hose itself.If corrosion builds up in this restricter,it'll cut the flow of coolant off completely to the heater core.The restricter is shown in the link below & the picture below.
https://www.google.com/search?q=89+5...xj1qmVNYmQM%3A
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91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
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12-19-2016, 11:48 AM
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#12
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Registered Member
Join Date: Mar 2014
Location: Miami
Region: Florida
Posts: 1,343
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OP any progress......come on man.
__________________
2016 VW GTI 2.0 Turbo
1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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