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240 temp gauge STILL reading high

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1975 - 1993 240
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krenekj
Posts: 124
Joined: 6 August 2009
Year and Model: Wife says too many
Location: Portland, Oregon
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240 temp gauge STILL reading high

Post by krenekj »

I've been addressing a number of problems on my new 93 240 non-turbo wagon, but one I cannot seem to solve is the temperature indicator on the dash. It is reading high (10-11 position) and I've tried all the usual fixes. Not sure what to do next so I'd like to know what others think. Here's what's been done so far to address the problem:

Pickup 240: temp gauge shows low temp, 7-8 position
Replaced broken thermostat (stuck open) with Volvo OEM and replaced coolant
Temp now reads high (10-11 position)
Tested wire, ground to block, temp goes to max
Replaced temp sensor - IPD (single yellow wire one)
No change - temp still reads high
Inspected temp compensation board - there is none!
Installed IPD bypass kit (pin 1 and 3)
No change - still reading high

When first warming up, the temperature comes close to hitting the red zone, and then drops back down and stabilizes at 10-11. It never drops lower, and only gets a little higher if we accelerate hard or climb a long hill. It never goes into the red.

I'd like to know if I'm running 'hot' or if my sensor, gauge, or thermostat is defective. Any thoughts or pointers are greatly appreciated.

Thanks.
93 240 Wagon
99 S70 NA 5sp
02 V70 NA
18 V90CC T5P*

rgk
Posts: 257
Joined: 16 March 2009
Year and Model: Gray 88 245
Location: Yellowstone
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Post by rgk »

Did you install the bypass kit properly? I just used an 18 gauge jumper wire.
rgk -- was dickdeadly

krenekj
Posts: 124
Joined: 6 August 2009
Year and Model: Wife says too many
Location: Portland, Oregon
Has thanked: 2 times
Been thanked: 1 time

Post by krenekj »

I believe so. I checked it twice - both pin location and connection friction.

Since the temp board was missing, I expected that adding the wire would do something, but it did not. Seems odd.
93 240 Wagon
99 S70 NA 5sp
02 V70 NA
18 V90CC T5P*

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