no heat cold cold cold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**truckdude239** · 12-23-2005, 08:26 PM

okay i trying to figure out how to get the heat to work in my 71 c-10 my blower motor is wires to an toogle switch you turn it on the fan comes on beside the leaves i need to get out it only blows cool air all the knobs on the heater control are gone i been driving around bundled up tight wearing gloves lol. but my windows fog up and onyl way to unfog them is to open the windows anyone tell me how to get the heat to work till i get my next check and can get an heat control? thanks in advance

JimKshortstep4x4 · 12-23-2005, 08:39 PM

Make sure the radiator is full of coolant and the engine is up to temperature. Check the heater hoses to see if they are both warm or not.

Also, let us know if the truck has AC or not.

Jim

71-longbed · 12-23-2005, 08:41 PM

check the air ducts inside the cab .. maybe one has come loose ... heater core might be plugged

**truckdude239** · 12-23-2005, 08:45 PM

radiotr is full and the core is not blocked pulled hose off and had buddy kick the engine there is water going though it i didn't know if it had something to do with the cables on the back of the heater control

c10chevy69 · 12-24-2005, 10:45 AM

Another thing to check for is a shut off valve inline with the heater hose going into the cab. I have one on mine for the summer. It gets hot enough in the cab without the heat blowing too.

67chevytrk · 12-24-2005, 10:54 AM

I don't know how rigged it is but check for a shut off valve on the heater hose, I have seen people install them for summer, if that is the case just open it.

krue · 12-24-2005, 11:04 AM

I used to keep a roll of paper towels in mine for defogging purposes.

**truckdude239** · 12-24-2005, 12:01 PM

no shut off vavle just hoses into the core only thing riged is the toogle swtich to turn the motor on the heater control has no handles soo i planing on getting an new when i get the money but not right now with christmass tomorrow

Blue Beard · 12-24-2005, 10:10 PM

Does your cab have A/C..?

Mine did and had to replace the unit with the flapper gate.

**truckdude239** · 12-24-2005, 10:20 PM

no no ac

dyingdeadman · 12-25-2005, 04:48 AM

heater control valve?

**truckdude239** · 12-25-2005, 08:15 AM

going to try what rick said to do since i have no handlkes on the heater control.

72k5 · 12-25-2005, 01:13 PM

Fire it up and see if both heater hoses are getting hot (too hot to hold onto with the truck warmed up). If they are, you have an air flow problem. If they are not, you have a water flow problem. At least that will tell you where to concentrate your efforts.

matt67350 · 12-25-2005, 03:07 PM

Without the controlls in place the heater is not going to work.

The cable that opens the flap is stuck shut. Remove the rest of the controlls.
look on the back to find the one that operates the flap. Pull or push the cable to see if it will move the flap. Use vicegrips the holt it open till you get a relacement control panel. I bet board members have one that you need.
Matthew

12-23-2005, 08:26 PM	#1
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	no heat cold cold cold okay i trying to figure out how to get the heat to work in my 71 c-10 my blower motor is wires to an toogle switch you turn it on the fan comes on beside the leaves i need to get out it only blows cool air all the knobs on the heater control are gone i been driving around bundled up tight wearing gloves lol. but my windows fog up and onyl way to unfog them is to open the windows anyone tell me how to get the heat to work till i get my next check and can get an heat control? thanks in advance __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-23-2005, 08:39 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: no heat cold cold cold Make sure the radiator is full of coolant and the engine is up to temperature. Check the heater hoses to see if they are both warm or not. Also, let us know if the truck has AC or not. Jim

12-23-2005, 08:41 PM	#3
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	Re: no heat cold cold cold check the air ducts inside the cab .. maybe one has come loose ... heater core might be plugged __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

12-23-2005, 08:45 PM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	Re: no heat cold cold cold radiotr is full and the core is not blocked pulled hose off and had buddy kick the engine there is water going though it i didn't know if it had something to do with the cables on the back of the heater control __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-24-2005, 10:45 AM	#5
c10chevy69 Registered User Join Date: May 2004 Location: Oklahoma City Posts: 205	Re: no heat cold cold cold Another thing to check for is a shut off valve inline with the heater hose going into the cab. I have one on mine for the summer. It gets hot enough in the cab without the heat blowing too. __________________ 1969 chevy C10 long bed 350 4bbl auto p/disc and 5 lug

12-24-2005, 10:54 AM	#6
67chevytrk Damn I'm broke Join Date: Nov 2005 Location: Roanoke Texas Posts: 49	Re: no heat cold cold cold I don't know how rigged it is but check for a shut off valve on the heater hose, I have seen people install them for summer, if that is the case just open it. __________________ [B]67 Chevy truck stepside small back window 96 Dodge Indyram 74 Dart Sport 96 Neon

12-24-2005, 11:04 AM	#7
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: no heat cold cold cold I used to keep a roll of paper towels in mine for defogging purposes. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-24-2005, 12:01 PM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	Re: no heat cold cold cold no shut off vavle just hoses into the core only thing riged is the toogle swtich to turn the motor on the heater control has no handles soo i planing on getting an new when i get the money but not right now with christmass tomorrow __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-24-2005, 10:10 PM	#9
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Re: no heat cold cold cold Does your cab have A/C..? Mine did and had to replace the unit with the flapper gate. __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

12-24-2005, 10:20 PM	#10
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	Re: no heat cold cold cold no no ac __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-25-2005, 04:48 AM	#11
dyingdeadman Registered User Join Date: Aug 2004 Location: san marcos,tx Posts: 266	Re: no heat cold cold cold heater control valve? __________________ 72 GMC sierra 3/4 ton 402 bb 68 GMC 3/4 ton 2010 camaro rs: daily driver

12-25-2005, 08:15 AM	#12
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	Re: no heat cold cold cold going to try what rick said to do since i have no handlkes on the heater control. __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-25-2005, 01:13 PM	#13
72k5 Registered User Join Date: Oct 2002 Location: Livermore, CA Posts: 566	Re: no heat cold cold cold Fire it up and see if both heater hoses are getting hot (too hot to hold onto with the truck warmed up). If they are, you have an air flow problem. If they are not, you have a water flow problem. At least that will tell you where to concentrate your efforts. __________________ 350 ETec 170 heads, Performer, HEI, Holly TBI, 700r4, 14 bolt rear, F&R lockers, lots of off road improvements.

12-25-2005, 03:07 PM	#14
matt67350 Registered User Join Date: May 2001 Location: Benbrook, TX Posts: 1,060	Re: no heat cold cold cold Without the controlls in place the heater is not going to work. The cable that opens the flap is stuck shut. Remove the rest of the controlls. look on the back to find the one that operates the flap. Pull or push the cable to see if it will move the flap. Use vicegrips the holt it open till you get a relacement control panel. I bet board members have one that you need. Matthew __________________ 69 swb stepside, rebuild and upgrade in progress



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