Looking for the thermosta. For a CDV 336 B-D. OLD PART SAYS 358W-136 L90.

FUSE all good, F13 is park relay power feed.


running lamps on truck not trailers.
parking lamps are all dead front and rear,?????not told good and bad both.
park= tail = running lamps, 3names but sure we know what you mean.
well fuses are first
and no trailer hitch wiring wrecks ,mangled, as seen all the time,
that blows those fuses or cuts wires that must never be cut.
rear only fail and rear left right, only parks dead
3 bulbs not blown, , one blows and is ignored.
is rear license plate lamp dead too, that too is PARK feed.??????
are side maker lamps dead too? Park feed, yes.
G301 rear not rusty? ground for park.

park relay dead kills them all

L90 park runs them all,.
fuses are first,. or connectors end to end of the car L90 park are bad. both parks dead and license; lamp dead. are they
L90 is DB/RD dark blue? red stripe I think.

L90 feed runs all park lamps on the car, even front so
we know front works and L90 at the switch below is good
that means all 3 lamps on the rear are burned out (expected too this old)
or the wiring in the car, rear, is bad. L90 bad or grounds to all lamps bad or trailer hitch wiring messes. endless seen,.

the 3500/3900 same location https://www.youtube.com/watch?v=5OPGAoinUkw&t=62s

drain coolant
unbolt thermosta housing
remove housing
out in new one, with wax side to correct side and jiggle pin up hill.
right side depends on engine options.
i never guess, or look at old one, i find the correct way and do that.
the FSM covers that.

Thanks for using FixYa and welcome to the site Clay. It could be either one of them. The only thing, there are many things that can cause this. Have you checked the fuel pressure? Could be a leaking injector. You could have a vacuum leak. It may be a MAP sensor, the Idle sensor, or the EGR. All of them are possible. What was your codes? I see the numbers but what is the detail?

first make sure car is coollllllllll follow the upper radiator hose from the radiator to the motor it will connect to a elbow there will be two bolts of the thermosta housing remove these two bolts under the housind will be a thermostat and a gasket replace both make sure to clean the surface good where the old gasket seated for proper seal of the new gasket

if you know where the thermostate is take it out place it in an old pan you can throw out fill with water place on stove and boil watch to see if its opening at rapid boil if not your thermostae is bad.Its a first place to start after you have checked to make sure antifreeze is full and isn't old and worn out should be bright green or orange depending on what type is in it.

http://public.servicebox.peugeot.com/ddb/code/index_en_us.htm

Select your model and year and then check on left hand side menu the desired documents.

Did you try any wrecking yards? That would be the cheapest route to go.

Change the thermostat and the fluid, that is more than enough. The hoses should be replaced if they are soft or leaking.  I'm presuming your car has 100k+ miles.  so also change the belts.

well if u changed thermosta did u noticed if both were same & had little hole on top of the old 1 lot of times aftermarket dont have them & u need to drill 1 urself same spot....or could b heater core going out