No Heat

JcSurge311 · December 19th, 2007, 04:27 AM

just wanting to see what everyone else thinks im getting no heat what so ever outta my heater ive checked the hoses running up to the firewall and they are plenty hot but my heater core isn't leaking either though so if someone could throw out some ideas be great to hear it

sonicblue · December 19th, 2007, 06:35 AM

is the car over heating if you let it run for a bit? if so your thermostat could be bad

shurb125 · December 19th, 2007, 07:45 AM

I have the same problem, and it seems that when you change from say defrost to floor or elswhere it dosen't change the route.

Jeimuzu · December 19th, 2007, 10:28 AM

This happened in another car that wasn't a Mustang but may apply here as well. Underneath the dash on the passenger side was a white clip that plugged a bunch of hoses together. Somehow that came apart just enough to leak, and the system would do exactly what you're saying. So I'd check around under there and make sure everything's snug and see if that helps.

ujslost · December 19th, 2007, 11:56 AM

Originally Posted by shurb125

I have the same problem, and it seems that when you change from say defrost to floor or elswhere it dosen't change the route.

That is a vaccum problem or a bad vent door acctuator

JcSurge311 · December 19th, 2007, 12:05 PM

Originally Posted by sonicblue

is the car over heating if you let it run for a bit? if so your thermostat could be bad

no it dont overheat one bit

JcSurge311 · December 19th, 2007, 12:06 PM

Originally Posted by ujslost

That is a vaccum problem or a bad vent door acctuator

how would i go about seeing if it was a vacuum leak cause its blowing out air fine just no heat

dr.gonzo · December 19th, 2007, 03:14 PM

My car does the same thing, I think its a fail safe thermostate that has stuck open so the coolent never slows down enough to heat up. my car doesnt overheat but it takes a 15 mile drive to feel even a little warm

JcSurge311 · December 20th, 2007, 03:06 AM

Originally Posted by dr.gonzo

My car does the same thing, I think its a fail safe thermostate that has stuck open so the coolent never slows down enough to heat up. my car doesnt overheat but it takes a 15 mile drive to feel even a little warm

hmm yeah ill give that a shot first sence it is the cheapest

Darrell · December 20th, 2007, 07:06 AM

There are a few possibilities. It could be the thermostat and it doesn't have to over heat. If the thermostat is stuck open you will have a low heat issue but on the factory gauge the car will appear to be running at the normal operating temperature since they read low on the factory gauge anyway. Another possibility is the heater core being plugged or the heater control valve being bad. With both hoses going to the heater core feeling warm I'm going to rule out the control valve. The heater core however could be bad or have blockage. Just because both hoses are warm doesn't necessarily mean there is coolant circulating thru the heater core.

ujslost · December 20th, 2007, 08:12 AM

Originally Posted by JcSurge311

how would i go about seeing if it was a vacuum leak cause its blowing out air fine just no heat

not switching between floor, vent, or defrost thats the vac problem. not the air temp problem

e3sean · December 20th, 2007, 02:25 PM

could be the switch not switching from cool air to heat..

Darrell · December 21st, 2007, 12:22 PM

Originally Posted by e3sean

could be the switch not switching from cool air to heat..

That would be the heater control valve

December 19th, 2007, 04:27 AM	#1
JcSurge311 Regular 1989 Mustang GT Hatchback N/A Join Date: Dec 2007 Location: Calhoun, Ga Posts: 150	No Heat just wanting to see what everyone else thinks im getting no heat what so ever outta my heater ive checked the hoses running up to the firewall and they are plenty hot but my heater core isn't leaking either though so if someone could throw out some ideas be great to hear it __________________ there can only be one....

December 19th, 2007, 06:35 AM	#2
sonicblue Hardcore Enthusiast 1990 GT Join Date: Aug 2006 Location: dalzell, south carolina Posts: 1,436	is the car over heating if you let it run for a bit? if so your thermostat could be bad __________________ 1990 5.0 getting all fixed up for next season 2004 mustang gt 520rwhp, 491 trq sold

December 19th, 2007, 03:14 PM	#8
dr.gonzo Enthusiast Join Date: Oct 2006 Location: kc mo Posts: 715	My car does the same thing, I think its a fail safe thermostate that has stuck open so the coolent never slows down enough to heat up. my car doesnt overheat but it takes a 15 mile drive to feel even a little warm __________________ FREE LUNCH, FINAL WISDOM, TOTAL COVERAGE... WHY NOT?

December 20th, 2007, 07:06 AM	#10
Darrell MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 6,574	There are a few possibilities. It could be the thermostat and it doesn't have to over heat. If the thermostat is stuck open you will have a low heat issue but on the factory gauge the car will appear to be running at the normal operating temperature since they read low on the factory gauge anyway. Another possibility is the heater core being plugged or the heater control valve being bad. With both hoses going to the heater core feeling warm I'm going to rule out the control valve. The heater core however could be bad or have blockage. Just because both hoses are warm doesn't necessarily mean there is coolant circulating thru the heater core. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

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December 19th, 2007, 07:45 AM	#3
shurb125 Regular 1993 Mustang LX Vert Join Date: Nov 2006 Location: South Carolina Posts: 432	I have the same problem, and it seems that when you change from say defrost to floor or elswhere it dosen't change the route.

December 19th, 2007, 10:28 AM	#4
Jeimuzu Regular Join Date: Oct 2007 Posts: 123	This happened in another car that wasn't a Mustang but may apply here as well. Underneath the dash on the passenger side was a white clip that plugged a bunch of hoses together. Somehow that came apart just enough to leak, and the system would do exactly what you're saying. So I'd check around under there and make sure everything's snug and see if that helps.

December 20th, 2007, 02:25 PM	#12
e3sean Hardcore Enthusiast Join Date: Nov 2007 Location: arizona Posts: 2,765	could be the switch not switching from cool air to heat..

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