Installed new radiator, not feeling hot air w/ heat on? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

swift996 · 01-31-2014, 03:54 PM

I installed a Mishimoto radiator and put almost two jugs of coolant in the system. I had the heat on to check for leaks. I couldn't find any and could feel the coolant warm up a little and move through the tubes.

I didn't have the car on for more than 5 minutes or so but the setting of Hi felt like cool air. Just curious if I neglected something? Perhaps it takes a bit to circulate? Thanks in advanced.

SubaSteve · 01-31-2014, 04:00 PM

Make sure the recirculate button is off.

swift996 · 01-31-2014, 04:05 PM

I did both ways and couldn't feel any heat. I popped the bleed screw off and gave the hose coming off the water pump a little squeeze and coolant shot out, so it's circulating.

CaptainSlow · 01-31-2014, 04:05 PM

Turn the fan down to 1. The higher the fan, the longer it's going to take to feel warm air. You're taking heat out of the cooling system for the heating system...the more heat you take out the longer it will take to come to temperature. This has been invaluable here in MI, where it takes forever for the car to warm up in the winter. I usually just turn the fan on 0 or 1 until the car gets up to temp, then turn the fan up a few more to get the temp up inside the cabin.

swift996 · 01-31-2014, 04:14 PM

I'm installing my intercooler tomorrow, so I'll have to wait until after to test. Maybe I just didn't let it get warm enough. The gauge showed normal operating temps after about 5mins but it was off a cold start.

CaptainSlow · 01-31-2014, 04:17 PM

You can always turn the heat on full and leave the car closed up for 5-10 minutes. You should definitely tell a difference when you check on it. Remember that even when the engine is up to temp, all of the plastic ducting and everything else also has to warm up before the air will truly come out hot...before then all of those surfaces will leech the heat right out of the air before it leaves the vents.

Sportsguy83 · 01-31-2014, 04:19 PM

Quote:

Originally Posted by swift996

I installed a Mishimoto radiator and put almost two jugs of coolant in the system. I had the heat on to check for leaks. I couldn't find any and could feel the coolant warm up a little and move through the tubes.

I didn't have the car on for more than 5 minutes or so but the setting of Hi felt like cool air. Just curious if I neglected something? Perhaps it takes a bit to circulate? Thanks in advanced.

Need to run the car more time.

CaptainSlow · 01-31-2014, 04:22 PM

Another note on the fan speed...the slower the air is moving in the system, the more time it has to absorb the heat. If you blast air right through, it won't have any time to warm up before it comes out, especially if the rest of the system and the rest of the cabin is still cold.

humfrz · 01-31-2014, 09:23 PM

Is the thermostat working properly ..... ??

midnight23 · 01-31-2014, 10:07 PM

takes about 5 minutes or longer usually to begin to get hot air for me.

FR-S Matt · 01-31-2014, 10:28 PM

My heater in my car is flippin insane with the stock radiator. I end up turning it down after about 10 minutes because I'm roasting. I can't wait to go to an aftermarket one, lol. Mainly for the summer.

pche · 01-31-2014, 10:35 PM

Sounds like you got a big air pocket in cooling system. Run it with the radiator cap off, watch the bubble comes up. Fill the over flow tank up, shut the car off after it get hot, the negative pressure would suck the coolant in.

jdubz13frs · 02-01-2014, 10:16 AM

Quote:

Originally Posted by pche

Sounds like you got a big air pocket in cooling system. Run it with the radiator cap off, watch the bubble comes up. Fill the over flow tank up, shut the car off after it get hot, the negative pressure would suck the coolant in.

Totally agree, haven't looked to close at mine to see if there are any bleed valves but you definetly have an air pocket in the heater core. Easiest way is to run it with the radiator cap off as stated above, and if that doesn't work driving the car around about 5 mins (~ 1-2 miles) should usually push stuff around.

jdubz13frs · 02-01-2014, 10:20 AM

Just looked around on ALLDATA, and here's something I didn't know - our twins have 2 thermostats. Looks like one is the normal engine thermostat, and the other may be for the in-cabin heating system? Anyone know what the second t-stat is for???

01-31-2014, 03:54 PM	#1
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 955 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	Installed new radiator, not feeling hot air w/ heat on? I installed a Mishimoto radiator and put almost two jugs of coolant in the system. I had the heat on to check for leaks. I couldn't find any and could feel the coolant warm up a little and move through the tubes. I didn't have the car on for more than 5 minutes or so but the setting of Hi felt like cool air. Just curious if I neglected something? Perhaps it takes a bit to circulate? Thanks in advanced. __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

01-31-2014, 04:05 PM	#3
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 955 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	I did both ways and couldn't feel any heat. I popped the bleed screw off and gave the hose coming off the water pump a little squeeze and coolant shot out, so it's circulating. __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

01-31-2014, 04:05 PM	#4
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Turn the fan down to 1. The higher the fan, the longer it's going to take to feel warm air. You're taking heat out of the cooling system for the heating system...the more heat you take out the longer it will take to come to temperature. This has been invaluable here in MI, where it takes forever for the car to warm up in the winter. I usually just turn the fan on 0 or 1 until the car gets up to temp, then turn the fan up a few more to get the temp up inside the cabin. __________________ Ultramarine 2013 Scion FR-S 6MT

01-31-2014, 04:14 PM	#5
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 955 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	I'm installing my intercooler tomorrow, so I'll have to wait until after to test. Maybe I just didn't let it get warm enough. The gauge showed normal operating temps after about 5mins but it was off a cold start. __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

01-31-2014, 04:17 PM	#6
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	You can always turn the heat on full and leave the car closed up for 5-10 minutes. You should definitely tell a difference when you check on it. Remember that even when the engine is up to temp, all of the plastic ducting and everything else also has to warm up before the air will truly come out hot...before then all of those surfaces will leech the heat right out of the air before it leaves the vents. __________________ Ultramarine 2013 Scion FR-S 6MT

01-31-2014, 04:00 PM	#2
SubaSteve Captain Cocoa Join Date: Jul 2012 Drives: CBS BRZ MT Location: MD Posts: 597 Thanks: 32 Thanked 282 Times in 161 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Make sure the recirculate button is off.

01-31-2014, 04:22 PM	#8
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Another note on the fan speed...the slower the air is moving in the system, the more time it has to absorb the heat. If you blast air right through, it won't have any time to warm up before it comes out, especially if the rest of the system and the rest of the cabin is still cold. __________________ Ultramarine 2013 Scion FR-S 6MT

01-31-2014, 09:23 PM	#9
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,409 Thanks: 29,793 Thanked 32,811 Times in 16,830 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Is the thermostat working properly ..... ??

01-31-2014, 10:07 PM	#10
midnight23 dying bird under the hood Join Date: Mar 2013 Drives: 2013 SWP Limited BRZ Location: Disneyland, California Posts: 1,331 Thanks: 546 Thanked 451 Times in 295 Posts Mentioned: 34 Post(s) Tagged: 0 Thread(s)	takes about 5 minutes or longer usually to begin to get hot air for me. __________________ GReddy Turbo BRZ tuned by Evasive Motorsports Build Thread Instagram

01-31-2014, 10:35 PM	#12
pche Guy on internet Join Date: Jun 2013 Drives: Slowly Location: PA Posts: 582 Thanks: 1,407 Thanked 492 Times in 233 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Sounds like you got a big air pocket in cooling system. Run it with the radiator cap off, watch the bubble comes up. Fill the over flow tank up, shut the car off after it get hot, the negative pressure would suck the coolant in.

02-01-2014, 10:20 AM	#14
jdubz13frs Member Join Date: Jul 2013 Drives: 2013 Scion FR-S 6MT Location: Canandaigua, NY Posts: 45 Thanks: 25 Thanked 18 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Just looked around on ALLDATA, and here's something I didn't know - our twins have 2 thermostats. Looks like one is the normal engine thermostat, and the other may be for the in-cabin heating system? Anyone know what the second t-stat is for???

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