Engine Coolant Thermostat Guide for the 1985-1988 Chevrolet Nova
Keep your Nova's Toyota-built engine from overheating or running cold with the right thermostat.
- This guide applies only to the 1985-1988 Chevrolet Nova, which is mechanically similar to a Toyota Corolla.
- A failing thermostat can cause either dangerous overheating (stuck closed) or no cabin heat (stuck open).
- On this specific car, the thermostat is located on the LOWER radiator hose connection to the engine, not the upper one.
- For best results, choose an OEM-equivalent brand like Beck Arnley or a trusted aftermarket brand like Gates, and always replace the gasket.
A Note on Your Nova's Unique History
This guide is specifically for the front-wheel-drive Chevrolet Nova made from 1985 to 1988. There was no Nova model from 1980-1984. Your car was part of a joint project between GM and Toyota, and it shares most of its mechanical parts, including its 1.6L engine, with the Toyota Corolla of the same era. This is important when choosing quality replacement parts.
Symptoms of a Failing Thermostat
A thermostat usually fails in one of two ways: stuck open or stuck closed. Here’s how to tell the difference.
🎬 Watch this guide to diagnose and replace a failing thermostat.- Engine Overheats Quickly: This is the most dangerous symptom. If the thermostat is stuck closed, it never allows coolant to get to the radiator to cool down. Your temperature gauge will climb into the red within minutes of driving. You might see steam from under the hood or smell coolant.
- Heater Blows Cold or Lukewarm Air: If the thermostat is stuck open, the engine may never reach its proper operating temperature, especially in cooler weather. Because the heater uses hot engine coolant to warm the cabin, you'll only get cool or slightly warm air from your vents.
- Temperature Gauge Stays Low: With a stuck-open thermostat, your temperature gauge may take a very long time to move, or it might not even reach the normal middle range.
- Poor Fuel Economy: An engine that runs too cold is inefficient. If your thermostat is stuck open, you might notice you're using more gas than usual.
Do Not Drive an Overheating Engine
If your temperature gauge is in the red, pull over and shut off the engine as soon as it is safe. Driving with an overheated engine can cause severe and permanent damage, including warped cylinder heads and complete engine failure.
Choosing the Right Aftermarket Thermostat
For the 1985-1988 Nova, the original parts were made by Toyota or their suppliers. Aftermarket quality can be excellent, but it helps to know the brands.
Brand Tiers for Your Nova:
- Tier 1: OEM Equivalent (Beck Arnley): Beck Arnley specializes in sourcing parts for import vehicles. Since your Nova has a Toyota engine, a Beck Arnley thermostat is likely to be a re-packaged part from the original equipment manufacturer, offering the best fit and reliability.
- Tier 2: High-Quality Aftermarket (Gates): Gates is a trusted name in cooling system parts and a preferred choice for many mechanics. They offer reliable performance. Be aware that in today's market, it's possible for a Gates box to contain a thermostat made by another manufacturer like Motorad.
- Tier 3: Standard Aftermarket (Motorad): Motorad is a large manufacturer that produces thermostats for many different brands. While functional, some professional mechanics and owners have noted they may not have the same long-term durability as OEM or Tier 1 options. They are a cost-effective choice for a basic replacement.
Pro Tip: Check the Location!
Unlike most cars where the thermostat is on the top hose, the 1985-1988 Nova's thermostat is located in the housing where the lower radiator hose connects to the engine. This is a feature of its Toyota-designed "reverse flow" cooling system. 🎬 See a walkthrough of the thermostat installation on this engine. Knowing this will save you a lot of confusion during the replacement.
Cost of Replacing a Chevrolet Nova Thermostat
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Thermostat | $10.56 - $28.19 |
| New OEM GM/Toyota Thermostat | $17 - $40 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions (FAQ)
Do I need to replace the gasket too?
Yes. Always install a new thermostat gasket or O-ring. Re-using the old one will almost certainly cause a coolant leak. Most new thermostats come with a new gasket included.
What temperature thermostat should I buy for my Nova?
You should use a thermostat with the factory-specified temperature rating, which is 82°C or 180°F for the 1985-1988 Nova. Using a thermostat with a different temperature can affect engine performance and efficiency.
Are there any recalls for the thermostat on my Nova?
No, there are no open recalls or common technical service bulletins (TSBs) from the NHTSA for the cooling system or thermostat on the 1985-1988 Chevrolet Nova. Any problems you experience now are due to the age of the components.
Can I replace the thermostat myself?
Yes, this is a DIY-friendly job for someone with basic tools. The key steps are draining some coolant, locating the thermostat housing at the end of the lower radiator hose, removing the housing, swapping the thermostat and gasket, and then refilling and bleeding the air from the cooling system. Make sure the new thermostat is installed in the same orientation as the old one.
🎬 Watch a mechanic demonstrate the full thermostat replacement process.Helpful Videos
Technical Specifications
OEM Part Numbers: 94856516 94859163 9091603060 9091603090 9091603069 9091603046
Opening Temperature: 82°C (180°F)
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chevrolet Nova:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- A Note on Your Nova's Unique History
- Symptoms of a Failing Thermostat
- Do Not Drive an Overheating Engine
- Choosing the Right Aftermarket Thermostat
- Pro Tip: Check the Location!
- Cost of Replacing a Chevrolet Nova Thermostat
- Frequently Asked Questions (FAQ)
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