My 89 ctd will not heat enough, on a long trip I can hardly get it up to 170f with an average of 140f. Keep in mind this engine is on a f350 and the ford radiator is more than twice the size than the one on the dodge.
I have blocked the radiator but it is still hard so My next step is the t-stat. What options are there for this engine?

I need something that will open at 200f or more so that the engine can get up to temperature and I can use the heat. Does anyone have a part # I can use at the local parts store or something I can order at the cummins dealer?

Thank You.

 

They make a 192* T-stat but if you cant open a 180* you'll never open a 192*. Remember Diesels don't build heat until you USE them.

Are you still running the mechanical fan? Perhaps it's time to switch to an electric.

 

I do work the engine and even blocked the radiator but My radiator is the one used for a 7.3l diesel engine so this doesn't help. I think the problem is he t-stat.

 

If the thermostat doesn't fix it, take the fan off and run fanless until spring.

 

I thought about doing this but I rather keep a setup that stays the same all year long. I see what t-stats are there for this engines.

Thank You.

 

a word of cation on t-stats, I ran two different parts store units, one was a cheapie that didn't work right, and actually ended up sticking closed and costing me a head gasket. I also ran a spendy parts store one, it also did not work properly. It would not open until the engine temp was almost too hot, and then it would cycle hot and cold. I now have a cummins t-stat, and while it does get hotter than it used too before it opens, it doesn't cycle like the parts store one did. Hope this helps a little.

 

no heat in the cab?
or do you want the engine to run hotter?

if theres not heat in the cab i'd look at the heater hose hook ups and on off valve.

 

Get the right radiator?

 

That isn't going to happen.

Well I got a 180f t-stat since I could not get the 192f I heard of. I drove the truck for less than 1/2 hour and it warmed up to 180f . It will go down but it comes right back up to 180f, since I have the radiator still blocked with cardboard. I like the results so far since I will have heat on this truck and I do need a little on the feet at least.


Thank You all.