How long does it take your engine to reach operating temps?

[_ExpeditionMan]

All,

How long does it take your engine to reach operating temps at moderate to hot temperatures? My '96 D1 takes up to 10-15 minutes (monitoring via OBD2 scanner) and when it's very cold I occasionally get a CEL warning that it's taken too long to warm up. I do eventually reach normal operating temps, but it takes a good while. The thermostat is less then 2 years old... any thoughts?

 

[discostew]

You probably need a thermostat. Or maybe you have air trapped in the system

 

[Blueboy]

All,

How long does it take your engine to reach operating temps at moderate to hot temperatures? My '96 D1 takes up to 10-15 minutes (monitoring via OBD2 scanner) and when it's very cold I occasionally get a CEL warning that it's taken too long to warm up. I do eventually reach normal operating temps, but it takes a good while. The thermostat is less then 2 years old... any thoughts?

‘96 D1 about 5 minutes at idle.

 

[Flyfish]

You probably need a thermostat.

Yep. It’s stuck open. Many thermostats are designed to fail in the open position.

 

[Swedjen2]

All,

How long does it take your engine to reach operating temps at moderate to hot temperatures? My '96 D1 takes up to 10-15 minutes (monitoring via OBD2 scanner) and when it's very cold I occasionally get a CEL warning that it's taken too long to warm up. I do eventually reach normal operating temps, but it takes a good while. The thermostat is less then 2 years old... any thoughts?

Do you have the OE set-up or the by-pass mod?

 

[Flyfish]

Do you have the OE set-up or the by-pass mod?

Don’t think I’ve seen this so just curious, what’s the bypass mod on a 96?

 

[_ExpeditionMan]

You probably need a thermostat. Or maybe you have air trapped in the system

Yep. It’s stuck open. Many thermostats are designed to fail in the open position.

Thanks for the feedback. I was considering this as a possiblity. As an additional data point, yesterday the ambient temperature was in the mid-70s and after a combination of stop/go and highway it still took about 10 minutes to reach operating temps in the 187-194 F range.

My searches show many people prefer the Britpart 180F thermostat. Do either of you have any opinions?

 

[_ExpeditionMan]

Do you have the OE set-up or the by-pass mod?

No bypass mod, but I thought that mod was just for D2's. My D1 has a dedicated thermostat housing just above the intake valley in front of the intake manifold with no T or bleeder valve near the fan shroud.

 

[rovercanus]

My searches show many people prefer the Britpart 180F thermostat. Do either of you have any opinions?

You won't find much Britpart love here. There are so many thermostat manufacturers out there just find a reputable brand and go with it.
https://www.rockauto.com/en/catalog....0l+v8,1187119,cooling+system,thermostat,2200

 

[michaels]

No bypass mod, but I thought that mod was just for D2's. My D1 has a dedicated thermostat housing just above the intake valley in front of the intake manifold with no T or bleeder valve near the fan shroud.

it's just a D2 thing. D1 just has the thermostat at the front of the intake. it's easy to swap out.maybe 10-15 minute job?

 

[Blueboy]

Thanks for the feedback. I was considering this as a possiblity. As an additional data point, yesterday the ambient temperature was in the mid-70s and after a combination of stop/go and highway it still took about 10 minutes to reach operating temps in the 187-194 F range.

My searches show many people prefer the Britpart 180F thermostat. Do either of you have any opinions?

RN has the Genuine part:

 

[_ExpeditionMan]

You won't find much Britpart love here. There are so many thermostat manufacturers out there just find a reputable brand and go with it.
https://www.rockauto.com/en/catalog....0l+v8,1187119,cooling+system,thermostat,2200

I was looking through their options earlier and noticed how many were available. Interestingly many lacked the small pin hole (fail safe) that the current one I have uses.

 

[_ExpeditionMan]

New genuine thermostat ordered (with gasket). Will report back if this solves the issue.

 

[discostew]

When you fill it take the plug out of the top of the radiator and fill the reservoir till it starts coming out that hole. You can catch all your coolant and put it right back. Get a long piece of rubber fuel line and push it to the bottom of the radiator thru that same hole and syphon the coolant right into a clean jug. Get a long enough piece of hose to reach below the bumper while the other end is at the bottom of the radiator.

 

[Blueboy]

When you fill it take the plug out of the top of the radiator and fill the reservoir till it starts coming out that hole. You can catch all your coolant and put it right back. Get a long piece of rubber fuel line and push it to the bottom of the radiator thru that same hole and syphon the coolant right into a clean jug. Get a long enough piece of hose to reach below the bumper while the other end is at the bottom of the radiator.

Good info.
He might want to renew the coolant if more than 2 years old.
Any tips on burping the system he might also need?

 

[discostew]

That is the tip for burping.

 

[_ExpeditionMan]

Issue resolved via fresh thermostat. The truck now reaches normal operating temps within several minutes. New coolant was also added and bled appropriately. Disappointed that the prior tstat lasted only two years.

 

[Flyfish]

Issue resolved. Disappointed that the prior tstat lasted only two years.

Good deal. Never be disappointed with an easy rover fix! But yea, it should have lasted longer than that.