Heater Defroster doesn't get Hot

FROM RADIATORS TO THERMOSTATS TO HEATER CORES, IT GOES HERE.

Moderator: LiftedAWDAstro

Post Reply
cfs
I am merely driving my van
I am merely driving my van
Posts: 21
Joined: Wed Oct 27, 2010 2:31 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Heater Defroster doesn't get Hot

Post by cfs » Tue Sep 18, 2012 11:37 pm

has anyone replaced a heater control valve yet ? My 2002 Astro doesn't get hot ?any ideas ? Radiator is full and water pump and Intake Gasket are brand new.

User avatar
doyoulikeithere
ASV Supporter
ASV Supporter
Posts: 2087
Joined: Wed Nov 18, 2009 4:27 am
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Misty Mountains of Cowichan BC.

Re: Heater Defroster doesn't get Hot

Post by doyoulikeithere » Wed Sep 19, 2012 7:21 pm

Question:
with the engine running: If you move the selector from 'COLD (blue)', to , 'hot (red)', can you actually hear the vacuum actuated door that directs the air, can you hear it move at all?
Reason for question: If the heater is heating, but the door isnt opening to allow the heat to get to the outlets, you will need to fix the vacuum leak that keeps your heater control from operating.
2016 Yamaha XSR900 - Silver.
2006 Kawasaki KLR 650 - Red.
1990 Astro - AWD
1987 Astro - With 5 Speed & 4wd.

LiftedAWDAstro
Site Admin
Site Admin
Posts: 4430
Joined: Sat Sep 09, 2006 10:35 pm
How many wheels are on an Astro van? (4): 6
Location: New Haven, NY

Re: Heater Defroster doesn't get Hot

Post by LiftedAWDAstro » Wed Sep 19, 2012 8:26 pm

You can check the 2 heater hoses that go into the box on the firewall on the passenger side. Theses 2 coolant hoses go to the heater core. If they are hot when selected for heat then the issue is not the control valve. There is a thread here someplace where one of the members replaced his control valve.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

cfs
I am merely driving my van
I am merely driving my van
Posts: 21
Joined: Wed Oct 27, 2010 2:31 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Re: Heater Defroster doesn't get Hot

Post by cfs » Tue Sep 25, 2012 1:19 am

Thank you for the tips and comments
Attachments
100_3812.JPG

LiftedAWDAstro
Site Admin
Site Admin
Posts: 4430
Joined: Sat Sep 09, 2006 10:35 pm
How many wheels are on an Astro van? (4): 6
Location: New Haven, NY

Re: Heater Defroster doesn't get Hot

Post by LiftedAWDAstro » Tue Sep 25, 2012 10:54 am

Great looking van! I love it!
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

cfs
I am merely driving my van
I am merely driving my van
Posts: 21
Joined: Wed Oct 27, 2010 2:31 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Re: Heater Defroster doesn't get Hot

Post by cfs » Tue Oct 02, 2012 11:48 pm

She's a 2002 Explorer Limited edition AWD High Top. Explorer Vans has been fantastic about factory replacement parts -122k miles on the clock.

trevcda
I am merely driving my van
I am merely driving my van
Posts: 19
Joined: Sun May 29, 2011 5:02 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Re: Heater Defroster doesn't get Hot

Post by trevcda » Fri Dec 14, 2012 11:36 pm

I hope you don't mind if I piggy back your thread; my questions are along the same lines.

I've got a 98 Safari. As it's been getting colder I've noticed that the heat/defrost gets warm but not really hot. I believe that the heater control valve is working fine, the engine just doesn't get that hot. The thermostat in the dash get a little above 100 but not much. Normally a cool running engine is a good thing. Is there something available that partially obstructs the radiator and could raise the temp a few degrees?

LiftedAWDAstro
Site Admin
Site Admin
Posts: 4430
Joined: Sat Sep 09, 2006 10:35 pm
How many wheels are on an Astro van? (4): 6
Location: New Haven, NY

Re: Heater Defroster doesn't get Hot

Post by LiftedAWDAstro » Sat Dec 15, 2012 12:01 am

I would see about replacing the thermostat. These 4.3's generate lots of heat so you most likely have a stuck open thermostat. What I used to do with my old cars was place a piece of cardboard in front of part of the radiator.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

User avatar
HPbyStan
I sleep in my van
Posts: 606
Joined: Sun Jan 27, 2008 4:15 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Janesville, Wis

Re: Heater Defroster doesn't get Hot

Post by HPbyStan » Sat Dec 15, 2012 1:17 pm

The heater hose fitting coming from the intake manifold is restricted down to a tiny opening and buying one with a larger hole or drilling out yours lets more hot water get to the heater instead of going directly to the engine radiator.
'04 White AWD Astro cargo
'00 Astro / El Camino
'61 BSA Super Rocket
'71 BSA B50 engine in a '67 C25 250 chassis
Impossible is just a degree of difficulty....

Post Reply