no air or heat....help!

lilman87 · 10-27-2005, 02:46 AM

on my 87' supra the air conditioning doesnt get cold enough to do anything in the summer and also the heat doesnt get hot in the winter. does anyone have any idea what might be causing this problem? i'm geting worried, in the summer i could just roll the windows down, but now in the winter i might be in trouble! lol

supra_91 · 10-27-2005, 01:55 PM

for the heater....replace the thermostat

as for the air conditioner....you might be low on freon

lilman87 · 10-27-2005, 08:38 PM

i was thinkin about changine the thermostate anyway so that will be good if it helps the heater. when i bought the car the guy said that there was a hole in one of the a/c lines so how would i go about testing that. that would probly be the reason that i would be low on freon.

supra_91 · 10-28-2005, 12:13 AM

find the line with the hole in it and replace it

lilman87 · 10-28-2005, 03:33 AM

anysugestions on how to find the line with the hole in it?

ddmcse · 10-28-2005, 12:28 PM

your heater problem is a broken valve that can be by-passed . i forget the details right now . the valve is passenger side (U.S) on the firewall it's one little swap of tubes and you'll get heat . research online you'll find it.
it's a vac switch and with no switch there's no hot water flowing into the heater core

mrnickleye · 10-29-2005, 07:16 AM

A/C...if its still R12 freon, you probably can't get any from a parts house. You will probably need to take it to a shop. They can check out the system for about $50 (my shops price).

Heater...while engine is running, just unplug the vacuum line from the engine, going to the VSV (wires to it) by the heater water valve, then plug it into the heater valve. Valve should work, you'll see it move. Normal operation is that water always flows thru the heater core, except when the temp controls are set to 65*.

lilman87 · 10-31-2005, 02:20 AM

awsome...thanks guys i will get to workin on it and let ya know. then again who knows when that will be but it will happen.

1988gte · 11-02-2005, 04:03 AM

Heater...while engine is running, just unplug the vacuum line from the engine, going to the VSV (wires to it) by the heater water valve, then plug it into the heater valve. Valve should work, you'll see it move. Normal operation is that water always flows thru the heater core, except when the temp controls are set to 65*.
Any pictures on this process?

mrnickleye · 11-03-2005, 04:42 AM

No pictures. The valve is on the passenger side firewall` up high. 2 heater hoses go into it.

10-27-2005, 02:46 AM	#1
lilman87 Stock Join Date: Oct 2005 Location: Illinois Posts: 20	no air or heat....help! on my 87' supra the air conditioning doesnt get cold enough to do anything in the summer and also the heat doesnt get hot in the winter. does anyone have any idea what might be causing this problem? i'm geting worried, in the summer i could just roll the windows down, but now in the winter i might be in trouble! lol

10-27-2005, 01:55 PM	#2
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	for the heater....replace the thermostat as for the air conditioner....you might be low on freon __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

10-28-2005, 12:13 AM	#4
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	find the line with the hole in it and replace it __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

10-28-2005, 12:28 PM	#6
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	your heater problem is a broken valve that can be by-passed . i forget the details right now . the valve is passenger side (U.S) on the firewall it's one little swap of tubes and you'll get heat . research online you'll find it. it's a vac switch and with no switch there's no hot water flowing into the heater core __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS Last edited by ddmcse; 10-28-2005 at 12:31 PM.

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10-27-2005, 08:38 PM	#3
lilman87 Stock Join Date: Oct 2005 Location: Illinois Posts: 20	i was thinkin about changine the thermostate anyway so that will be good if it helps the heater. when i bought the car the guy said that there was a hole in one of the a/c lines so how would i go about testing that. that would probly be the reason that i would be low on freon.

10-28-2005, 03:33 AM	#5
lilman87 Stock Join Date: Oct 2005 Location: Illinois Posts: 20	anysugestions on how to find the line with the hole in it?

10-29-2005, 07:16 AM	#7
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	A/C...if its still R12 freon, you probably can't get any from a parts house. You will probably need to take it to a shop. They can check out the system for about $50 (my shops price). Heater...while engine is running, just unplug the vacuum line from the engine, going to the VSV (wires to it) by the heater water valve, then plug it into the heater valve. Valve should work, you'll see it move. Normal operation is that water always flows thru the heater core, except when the temp controls are set to 65*.

10-31-2005, 02:20 AM	#8
lilman87 Stock Join Date: Oct 2005 Location: Illinois Posts: 20	awsome...thanks guys i will get to workin on it and let ya know. then again who knows when that will be but it will happen.

11-02-2005, 04:03 AM	#9
1988gte 3" Exhaust Join Date: Jul 2005 Location: Lubbock Texas Posts: 140	Heater...while engine is running, just unplug the vacuum line from the engine, going to the VSV (wires to it) by the heater water valve, then plug it into the heater valve. Valve should work, you'll see it move. Normal operation is that water always flows thru the heater core, except when the temp controls are set to 65*. Any pictures on this process?

11-03-2005, 04:42 AM	#10
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	No pictures. The valve is on the passenger side firewall` up high. 2 heater hoses go into it.