Jeep CTO Switch Interchange Chart

Properly-functioning CTO (Coolant Temperature Override) Switches on Full-Size Jeep engines are essential to proper engine performance; over time they leak vacuum or cease to function properly, causing a rough idle, poor fuel-economy and driveability problems. When you go looking for replacements at your neighborhood auto-part store, however, they look at you like you have three heads. What are you to do?

Well, first, everybody else in the world (besides Jeep) calls these parts "Thermostatic Vacuum Switches" (TVS for short), as they direct vacuum to different ports based on coolant temperature. Even if you ask for a TVS for your Jeep, the parts catalog will often show none available, or will list one, when in fact you have three to replace. The Jeep dealer is always an option, but unless you have the rare Jeep dealer who discounts parts to over-the-counter customers, you'll be paying a fortune; over $100 for the three switches for a later Grand Wagoneer alone!

Well, despite what they say, your local parts-store probably does have the CTO switch you want, in stock, at a much-better price than the dealer.In the chart below, I list the various CTO switches you may encounter on your Jeep, with the corresponding Jeep part number and the aftermarket equivalents. I have checked and double-checked most of these parts via online cross-references in many parts-lookup search functions, and have personally verified the compatibility of the Borg-Warner EC970 and Wells #'s E901 and E960 units with their Jeep counterparts.

If you have any additions, corrections, questions, or further cross-reference information or sources, e-mail me!

I have listed the CTO switches by the number of ports, the most common factory color, and the temperature at which it swtiches vacuum sources (when such information was available). I have also listed an approximate price; this is not necessarily the best price, or the price you will pay, but rather a price that I have seen somebody charge or be charged.
 
Description Jeep Part # Miscellaneous Borg-Warner NAPA/Echlin Everco Filko Standard Wells
3-port red 
220 deg vac
J5358881,
3200853
$23.00 
N/A EC970
$9.99
CRB21000
$14.99
H1934
$13.01
38-116
$23.42
N/A E900
$14.99
3-port yellow/white
155 deg
J3235917,
3229450,
3216448
$42.26
Tomco
13303
$16
EC945
$18.35
CRB229035
$26.49
H2942
$19.52
or
H2944
$19.87
38-112 PVS10
$19.49
E901
5-port b/w
115deg
33001669,
3238932
$ 45.71
GP-Sorenson
7791837
$29.99
Niehoff
FE462
EC957
$25.23
CRB229048
$34.99
N/A N/A PVS61
$29.76
E960
2-port J3241675 N/A EC2916
$17.05
N/A N/A N/A PVS121
$16.89
E9041
2-port black/white 115deg 3228288,
3225912
N/A N/A CRB21084
$17.99
H1908 38-118
$22.37
PVS17
$26.18
E907
$19.99
2-port black 92-98deg 3226361, 3228894 N/A N/A CRB21187
$26.99
N/A 38-100
$26.29
N/A E903
2-port EGR 3218940 N/A N/A CRB229049
$42.49
N/A N/A PVS9
$11.43
E930
5-port orange 3241784 N/A EC958
$27.27
N/A N/A N/A N/A E956
4-port black 
spark evap
8953003010 N/A EC960
$11.33
N/A N/A N/A N/A E958
$14.99

Necessary Legal Disclaimer: Of course, I make no guarantees about the accuracy or useability of the information of this chart; any risk, damage, loss, injury or other thing that you don't like that may happen as a result of using, employing, reading or thinking about the information on this page is entirely your fault. Hey, I'm just trying to help here, so don't sue me... ;)

RETURN TO TECH PAGE