Heating issues

[joker_fly]

Well atleast i bought me a rig


Its a suburban 1500 1995 350
But it has a problem

It dosent get warm

Dashbord blows hot but not nerly enough

And since i live in sweden and the outside temp is -15 celsius its cold as **** =)

Att the rear the only air i can get blowing is cold (Ice cold), and the fan seams not to be blowing like it should be, i can hear it change speeds but i just dont think it blows enough ?

Help me plez

Kim / Sweden

 

[DT75FLH]

2 issues off the top of my head

the blend door for the outside air (inside the duct work under the dash) is stuck open.

or the heater core is clogged

look for the heater hose lines going into the heater core area from the engine compartment.

is one line warm to the touch and another cold?

are both lines cool?

that would indicate no flow through the heater core... especially if someone used stop leak etc or hasn't keep up with the coolant flush/change or used hard water.

 

[sargeek]

check hoses

a suburban should generate enough heat to heat the cabin, no problem.

Check to make sure the heater hoses are connected to the rear heater core. Rather than replace a bad heater core, people will bypass it.

 

[dzzz]

radiator thermostat

If the engine is slow to warm up.

 

[wanderer-rrorc]

MOUSENESTS!!!

several trucks/vans I have had did the same...little to no airflow..the airbox's were full of last summers mouse nests...

also flush the heatercores with a garden hose...run it both ways a few times..you'll be AMAZED how much scale/crud gets in them....

 

[joker_fly]

Thanks

Mice seams to be an option =)


Im going to change the T-stat but is it saled with oring or gasket ?

so does the rear heater core but where is it lokated ?

does any body have pics how to garden house them ?


And i really must say thank you =) all

 

[SunTzuNephew]

Mice seams to be an option =)


Im going to change the T-stat but is it saled with oring or gasket ?

so does the rear heater core but where is it lokated ?

does any body have pics how to garden house them ?


And i really must say thank you =) all

Tstat has a gasket, a replacement should come with the tstat. I also put permatex gasket seal on mine, when I have to change them. I don't have a rear heater core (just front in my Yukon, which is similar enough) but there should be two sets of smallish (25mm) diameter heater hoses running through the firewall: one set is the front, the other the rear core. Flush them both out. You may want to do a chemical cleaning of the entire cooling system, and of course replace any hoses that appear worn.

Good luck!

 

[mrblond]

some trucks have a vac actuated heater valve to allow rad fluid into the heater core. look for this valve at the heater lines going into the fire wall in the eng compartment

 

[joker_fly]

Tstat has a gasket, a replacement should come with the tstat. I also put permatex gasket seal on mine, when I have to change them. I don't have a rear heater core (just front in my Yukon, which is similar enough) but there should be two sets of smallish (25mm) diameter heater hoses running through the firewall: one set is the front, the other the rear core. Flush them both out. You may want to do a chemical cleaning of the entire cooling system, and of course replace any hoses that appear worn.

Good luck!

Well my new t stat did not come with a new gasket so thats why i figured it was an oring type ?

But there is a rubber seal around the t-stat itself is this enough or do i need to order a gasket also ?

Dont wanna remove it and se oh **** i need more parts =( bieng xmas and all parts are scarce

 

[SunTzuNephew]

Well my new t stat did not come with a new gasket so thats why i figured it was an oring type ?

But there is a rubber seal around the t-stat itself is this enough or do i need to order a gasket also ?

Dont wanna remove it and se oh **** i need more parts =( bieng xmas and all parts are scarce

No, the gasket goes on the housing....when I get a thermostat the new gasket comes in the box. I'd get one before I started. Or, get some aviation form-a-gasket and hope for the best..... Or if you have a sheet of gasket material, they're simple enough to cut your own.

The only time I reuse a thermostat housing gasket is when I remove the thermostat prior to flushing the cooling system. If it leaks a bit then, it's not a problem. But I certainly put a new gasket in (usually I'll just replace the thermostat at that time, they're not that expensive).

Over the years I've received a lot of good experience wrt cooling systems, mainly by using a lot of bad judgment, including ruining a couple of engines. These days I do it just by the book.

 

[ntsqd]

If there is a gasket there, it needs a new gasket. If all it has is the seal around the t-stat then that is all that should be used. Take care that however you got the truck is how it is supposed to be and not the way someone before you left it.

Can normally check heater core flow with a garden hose. Use one of the old type hose nozzles and hose clamp the end of one hose to it. Remove the other hose from what ever it attaches to and check the exit flow with the nozzle wide open and the spigot slowly turned on while checking the flow. I say slowly because if the core is plugged you do not want to apply full house pressure to the heater core. At minimum, house pressure (in the U.S. anyway) is at least twice that of normal cooling system pressure.

I've had pretty good success with cleaning out heater cores using vinegar. A day or two soak is needed. Be sure to flush thoroughly and vigorously rinse off any splash in the engine bay.