2000 7.3 runs hot and no heat?????

superstroker99 · Mar 20, 2013

I got a 2000 7.3 wants to run hot driving down the road and dose not have any heat. Both hoses to the heater core are cold. Running idle in the shop i can put the pressure tester on it pump it to about 10 psi and both lines get hot and heat works fine take the pressure off both line cool of and loses heat. Sitting idle it will not run hot. but down the road about 3 miles it will over heat. This is on my puller/dd. I pulled this weekend at rudys. It blew alot of water out at the end of the run. I filled it back up after it cooled of and all was fine drove it sunday and monday no problems this started yesterday. I would call out a head gasket but the no heat deal as me stumped. I dont know how else to test it. any help would be great!

lincolnlocker · Mar 20, 2013

is the thermostat stuck shut?

POWER-STRUCK · Mar 20, 2013

blew water out? are you using any power adders? have any more details on the mods you have done? this could be as simple as a bad fan clutch and air trapped in the cooling system.

bluedge8 · Mar 20, 2013

have you re checked the coolant level, no heat is usually lack of coolant

superstroker99 · Mar 20, 2013

has nitrous a .092 jet but did not use it. coolant is full untill it runs hot and pushes out. I thought air as well. i have pulled hoses off and filled with a funnel. Still did it. Just put it back together a few min have heat and wont run hot now so i guess ill head home and hope for the best. I know "air lock" will cause the same issues

Whytry · Mar 20, 2013

Smoke?

superstroker99 · Mar 20, 2013

Truck has 350/200 full force injectors ported heads has a RCD S475/96 charger with a 2.6 cover. full reg return all the usual stuff tuned by brian jelich.

POWER-STRUCK · Mar 20, 2013

does it at least have head studs?

lincolnlocker · Mar 20, 2013

if the water pump is turning, shouldnt the heater core lines be hot?

live life full throttle

bluedge8 · Mar 20, 2013

lincolnlocker said:
if the water pump is turning, shouldnt the heater core lines be hot?

live life full throttle

not if there is no coolant,,,

lincolnlocker · Mar 20, 2013

well duh!

live life full throttle

Rideracelivemx7 · Mar 20, 2013

sounds like a mean air pocket, there was a stock superduty I did a pump in. was doing this exact same thing. park the ****er on a hill or something

907DAVE · Mar 20, 2013

You blew a headgasket.

No heat is from combustion gasses trapped in the heater core. Its almost always the first sign of HG failure.

Whytry · Mar 20, 2013

Hg was my first thought

nasty6.6 · Mar 20, 2013

break out the jb weld

Freightshaker · Mar 20, 2013

Do you have flow? I had a dodge run me ragged thinking it was air. Finally after exhausting all else I pulled the water pump and the impeller spun off the splines. No noise from pump just temps would steadily gain.

Freightshaker · Mar 20, 2013

Freightshaker said:
Do you have flow? I had a dodge run me ragged thinking it was air. Finally after exhausting all else I pulled the water pump and the impeller spun off the splines. No noise from pump just temps would steadily gain.

Whoops nevermind... Missed that part about blowing water out.

Rideracelivemx7 · Mar 20, 2013

if it was the head gasket(which certainly sounds like it as well) wouldn't he be puking just going down the road if the leak was that bad to cause a no heat issue. or excessive bottle pressure?