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Author Topic: 160* thermostat a problem?  (Read 5819 times)
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« on: June 10, 2015, 09:22:27 pm »

Greetings all,

Here is an odd question: would a 160* thermostat prevent the ECU from displaying any codes? If the car never warms up completely, would this be an issue? I would think it would be an issue, but I'm wanting to hear some opinions.
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« Reply #1 on: June 11, 2015, 01:28:06 am »

Shooting from the hip here, but some codes would trigger while others might not.

Kind of a vague question though!
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« Reply #2 on: June 11, 2015, 03:30:35 am »

I had a high flow 160° thermostat in a 5.0 F-150 at one time. It would never reach operating temperature, the heater sucked, and it got even worse mileage than normal.

It was installed while chasing a cooling issue, wound up being a restricted radiator. After fixing that, the above issues started. A 195° unit fixed all of them. However, the truck did have a much larger radiator and fan than would reasonably be in any car.
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« Reply #3 on: June 11, 2015, 05:48:43 am »

Some computers have issues, others don't. To be safe the 180 is a good choice.
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« Reply #4 on: June 11, 2015, 06:56:32 am »

Greetings all,

Here is an odd question: would a 160* thermostat prevent the ECU from displaying any codes? If the car never warms up completely, would this be an issue? I would think it would be an issue, but I'm wanting to hear some opinions.

Codes display will not be affected as a matter of fact, if the system doesn't reach operating temperature (>160°F), the related failure codes will be flashed and fuel consumption will be high. IOW.... there is no connection between the t-stat that will prevent the self tests to be executed. A 180°F t-stat is your best alternative.
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« Reply #5 on: June 11, 2015, 10:29:16 am »

Sorry if my post was vague, and also apologize if my thoughts come across jumbled.

I'm going over my new to me 87 GT with a fine tooth comb. Fixing little issues the previous owner potentially caused. It's slow going since I don't have much time on my hands these days. The main issue at hand was a slight idle surge the car has every now and then. Wanted to pull the codes, but...

I'm unable to pull any codes. I've tried an Actron reader, jumper wires, and a VDOM...haven't used the test light method yet. Everything on the car seems stock, minus the deletion of EGR and smog equipment (vacuum leaks don't seem apparent). I've been going over the wiring to check as well.   Thought the 160 thermostat previously installed was a possible culprit (I'm throwing a 192 in there next week hopefully).

So my issue remains...unable to pull codes. Hope to proceed with the test light method next week as well.

Thanks for the advice and suggestions.
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