98 Dodge 1500, No heat

Andrewpott · 10-23-2009, 02:05 PM

I recently changed my water pump and radiator on my 98 dodge Ram 1500. After I got it back together and running I didn't have any heat. I then changed the thermostat. Still no heat. Any suggestions??

silverhairdeere · 10-23-2009, 02:47 PM

is the hoses going to the heater warm .

shd

chadwickthomas · 10-28-2009, 02:46 AM

sounds like your water valve is not opening, i dont know on that model if itis vacuum or electically controlled but there is a valve on the system that closes when you turn your ac on to keep hot water away from your evaperator.If the problem is your just not getting air flow from your vents and your control doors are functioning you will have to remove your evaperator from the case and clean it cause its matted shut with debree and will not let the air flow

bradrhale · 10-28-2009, 12:06 PM

98 doesnt have a hot water control valve. they all had blend doors that alternated the flow of air through either the heater core or evaporator core.
unusual that it worked before and not after. seems like the blend door idea would be a great place to start but knowing whether you have circulation through the core is much needed information.

leolkfrm · 10-28-2009, 01:46 PM

sounds like it needs a burping!......air block in the system

bradrhale · 10-28-2009, 02:36 PM

that gets my vote right there.

chevyguy · 11-07-2009, 03:24 PM

Disconnect your coolant lines going to your heater core, Runa a garden hose thru it and see if you have flow thru your heater core. if you do, Its that little motor under the passenger side fo the dash that isnt opening to heater door. You will need a Z screwdriver to get to the screws. Stupid design. Mine was out on my 99. I cleaned it up adn got it to work long enough to sell the truck.

Norgale · 11-08-2009, 12:11 PM

You sure the hoses are hooked up right? Check the vacuum lines too. Maybe one got knocked off and the door won't open to let the heat out. Good idea to check the hoses when the engine is warmed up to see if they are hot. Pete

10-23-2009, 02:05 PM	#1
Andrewpott Junior Member Join Date: Oct 2009 Posts: 1	98 Dodge 1500, No heat I recently changed my water pump and radiator on my 98 dodge Ram 1500. After I got it back together and running I didn't have any heat. I then changed the thermostat. Still no heat. Any suggestions??

10-28-2009, 01:46 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	sounds like it needs a burping!......air block in the system __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-07-2009, 03:24 PM	#7
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	Disconnect your coolant lines going to your heater core, Runa a garden hose thru it and see if you have flow thru your heater core. if you do, Its that little motor under the passenger side fo the dash that isnt opening to heater door. You will need a Z screwdriver to get to the screws. Stupid design. Mine was out on my 99. I cleaned it up adn got it to work long enough to sell the truck. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

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10-23-2009, 02:47 PM	#2
silverhairdeere Senior Member Join Date: Feb 2008 Location: land between the lakes tn Posts: 1,184	is the hoses going to the heater warm . shd

10-28-2009, 02:46 AM	#3
chadwickthomas Junior Member Join Date: Oct 2009 Posts: 11	sounds like your water valve is not opening, i dont know on that model if itis vacuum or electically controlled but there is a valve on the system that closes when you turn your ac on to keep hot water away from your evaperator.If the problem is your just not getting air flow from your vents and your control doors are functioning you will have to remove your evaperator from the case and clean it cause its matted shut with debree and will not let the air flow

10-28-2009, 12:06 PM	#4
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,030	98 doesnt have a hot water control valve. they all had blend doors that alternated the flow of air through either the heater core or evaporator core. unusual that it worked before and not after. seems like the blend door idea would be a great place to start but knowing whether you have circulation through the core is much needed information.

10-28-2009, 02:36 PM	#6
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,030	that gets my vote right there.

11-08-2009, 12:11 PM	#8
Norgale Full Member Join Date: Oct 2009 Location: Bonita Springs,Florida Posts: 22	You sure the hoses are hooked up right? Check the vacuum lines too. Maybe one got knocked off and the door won't open to let the heat out. Good idea to check the hoses when the engine is warmed up to see if they are hot. Pete